A 50 year old guy cannot have a 25 year old body, except ...
https://en.wikipedia.org/wiki/Body_Worlds
For better visually more interesting results,
just search on google, the wiki article is a bit spare some,
with examples.
"body of a 25 year old" vs "body like a 25 year old"
So the only logical conclusion is: dead bodies in the cellar.