She found that people who had positive ideas about their own ageing (who agreed with comments such as "I have as much pep as last year" and who disagreed that as you get older you get less useful) lived for an average of 22.6 years after they first participated in the study, while the people who felt less positively about ageing lived for just 15 years more on average.

In this study, it didn't matter as much what people thought about the physical implications of ageing, what mattered was whether they believed they would still develop and grow mentally.  

https://www.bbc.com/future/article/20220719-can-you-delay-ageing-by-refusing-to-act-your-age

Your Hands as You Age - https://www.webmd.com/healthy-aging/ss/slideshow-your-hands