纽约时报 | 心理年龄和生理年龄:哪个对健康更重要

The age you feel means more than your actual birthdate […]

The age you feel means more than your actual birthdate

Imagine, for a moment, that you had no birth certificate and your age was simply based on the way you feel inside. How old would you say you are?


Like your height or shoe size, the number of years that have passed since you first entered the world is an unchangeable fact. But everyday experience suggests that we often don’t experience ageing the same way, with many people feeling older or younger than they really are.


Scientists are increasingly interested in this quality. They are finding that your ‘subjective age’ may be essential for understanding the reasons that some people appear to flourish as they age C while others fade. “The extent to which older adults feel much younger than they are may determine important daily or life decisions for what they will do next,” says Brian Nosek at the University of Virginia.

科学家们对这种特点的兴趣渐增。他们开始发现,"主观年龄"至关重要,这有助于理解为什么有些人随着年岁增长精神愈发饱满,而另一些人则未老先衰。弗吉尼亚大学的诺塞克(Brian Nosek)说:"年纪大的人觉得自己在多大程度上小于自己的实际年龄,可能会决定他们如何做出日常判断或生命决策。"

Its importance doesn’t end there. Various studies have even shown that your subjective age also can predict various important health outcomes, including your risk of death. In some very real ways, you really are ‘only as old as you feel’.


Given these enticing results, many researchers are now trying to unpick the many biological, psychological, and social factors that shape the individual experience of ageing C and how this knowledge might help us live longer, healthier lives.


This new understanding of the ageing process has been decades in the making. Some of the earliest studies charting the gap between felt and chronological age appeared in the 1970s and 1980s. That trickle of initial interest has now turned into a flood. A torrent of new studies during the last 10 years have explored the potential psychological and physiological consequences of this discrepancy.


One of the most intriguing strands of this research has explored the way subjective age interacts with our personality. It is now well accepted that people tend to mellow as they get older, becoming less extroverted and less open to new experiences C personality changes which are less pronounced in people who are younger at heart and accentuated in people with older subjective ages.


Interestingly, however, the people with younger subjective ages also became more conscientious and less neurotic C positive changes that come with normal ageing. So they still seem to gain the wisdom that comes with greater life experience. But it doesn’t come at the cost of the energy and exuberance of youth. It’s not as if having a lower subjective age leaves us frozen in a state of permanent immaturity.


Feeling younger than your years also seems to come with a lower risk of depression and greater mental wellbeing as we age. It also means better physical health, including your risk of dementia, and less of a chance that you will be hospitalised for illness.


Yannick Stephan at the University of Montpellier examined the data from three longitudinal studies which together tracked more than 17,000 middle-aged and elderly participants.

蒙彼利埃大学(University of Montpellier)的斯蒂芬(Yannick Stephan)对三项纵向研究的数据进行了分析,这些研究总共跟踪了逾1.7万名中年和老年参与者。

Most people felt about eight years younger than their actual chronological age. But some felt they had aged C and the consequences were serious. Feeling between 8 and 13 years older than your actual age resulted in an 18-25% greater risk of death over the study periods, and greater disease burden C even when you control for other demographic factors such as education, race or marital status.


There are many reasons why subjective age tells us so much about our health. It may be a direct result of those accompanying personality changes, with a lower subjective age meaning that you enjoy a greater range of activities (such as travelling or learning a new hobby) as you age. “Studies have found, for example, that subjective age is predictive of physical activity patterns,” Stephan says.


But the mechanism linking physical and mental wellbeing to subjective age almost certainly acts in both directions. If you feel depressed, forgetful, and physically vulnerable, you are likely to feel older. The result could be a vicious cycle, with psychological and physiological factors both contributing to a higher subjective age and worse health, which makes us feel even older and more vulnerable.


Stephan’s analysis, which is now in press in the journal of Psychosomatic Medicine, is the largest study of the effect of subjective age on mortality to date. These large effect sizes demand close attention. “These associations are comparable or stronger than the contribution of chronological age,” says Stephan.

史蒂芬的分析结果刊登在了《身心医学》(Psychosomatic Medicine)期刊上,这是迄今为止关于主观年龄对死亡率影响的规模最大的研究。这些因主观年龄产生的巨大效应需要密切关注。"这些关联与实际年龄所带来的影响相当,甚至更强,"斯蒂芬说。

Put another way: your subjective age can better predict your health than the date on your birth certificate.


With this in mind, many scientists are trying to identify the social and psychological factors that may shape this complex process. When do we start to feel that our minds and bodies are operating on different timescales? And why does it happen?


Working with Nicole Lindner (also at the University of Virginia), Nosek has investigated the ways the discrepancy between subjective and chronological age evolves across the lifetime. As you might expect, most children and adolescents feel older than they really are. But this switches at around 25, when the felt age drops behind the chronological age. By age 30, around 70% of people feel younger than they really are. And this discrepancy only grows over time. As Nosek and Lindner put it in their paper, “Subjective ageing appears to occur on Mars, where one Earth decade equals only 5.3 Martian years.”

诺塞克和同样在弗吉尼亚大学工作的林德纳(Nicole Lindner)一起研究了人一生中主观年龄和实际年龄之间的差异是如何演变的。你可能已经预料到,大多数孩子和青少年觉得自己比实际年龄要大。但这种情况在25岁左右就开始转变了,那时人们感觉心理年龄要比实际年龄小。到30岁时,大约70%的人觉得自己比实际年龄要年轻,并且这种差异只会逐渐拉大。正如诺塞克和林德纳在论文中所说,"主观老化似乎发生在火星上,而地球上的10年只相当于火星上的5.3年。"

Lindner and Nosek also measured the “desired age” of their participants C which, to their surprise, also followed Martian time. “It keeps going up with us, and at just a slightly slower rate than how we feel right now,” Nosek said. This would seem to “support the idea that we experience our life experiences as continuously getting better, just a bit more slowly than our actual experiences,” he says. It’s not as if there is one single peak age. Again, this flip occurs in our mid-20s: 60% of 20-year-olds want to be older. But by the age 26, 70% would prefer to be younger, and from then on, most people view the recent past with the rosiest spectacles.


Some psychologists have speculated that a lower subjective age is a form of self-defence, protecting us from the negative age stereotypes C as seen in a nuanced study by Anna Kornadt at Bielefeld University in Germany.

一些心理学家推测,拥有较低的主观年龄是一种自我防卫,保护我们不受消极的年龄刻板印象的影响。德国比勒费尔德大学(Bielefeld University)的科纳德(Anna Kornadt)在一项细致入微的研究中也看到了这一点。

Kornadt’s study hinged on the idea that people’s subjective age might be a multifaceted thing that varies in different domains. You may feel differently when you think about yourself at work compared with when you think about your social relationships, for example. And so Kornadt asked participants to say whether they felt younger or older than they really were in different areas of life.


Sure enough, she found that people’s subjective ages were lower when negative age stereotypes are most prevalent C such as work, health and finance C which would seem to support the idea that this thinking helps people distance themselves from the negative connotations of their age-group. Believing “I may be 65 but I only feel 50” would mean you are less worried about your performance at work, for instance. Kornadt also found that people with a lower subjective age tended to imagine their future self in a more positive light.


By protecting us from our society’s dismal view of ageing and giving us a more optimistic view of our future, this self-defence could, in turn, further explain some of the health benefits of feeling younger than you really are.


Despite these advances, scientists are only getting to grips with their potential implications, though it is certainly possible that future interventions might try to reduce participants’ subjective age and improve their health as a result. In one of the few existing studies, elderly participants in a fitness regime enjoyed greater strength gains if the experimenters praised their performance relative to other people of their age.


And given its predictive power C beyond our actual chronological age C Stephan believes that doctors should be asking all their patients about their subjective age to identify the people who are most at risk of future health problems to plan their existing health care more effectively.


In the meantime, these findings can give us all a more nuanced view of the way our own brains and bodies weather the passing of time. However old you really are, it’s worth questioning whether any of those limitations are coming from within.


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