A man in Europe is suing to do just that. He is 69yrs old but says he looks and feels like he is 49 yrs old.
Claims is would help him with job opportunity and credit issues (new car etc) And it would help his dating prospects on Tinder.
https://www.bbc.com/news/world-europe-46133262
We could all identify as a 65 yr old and get Social Security, right?