JoJo's Bizarre Adventure - Stone is Unbreakable

Oh geez, looks like I butchered that sentence. I meant to say that due to Jotaro's knowledge of the future in the Eyes of Heaven universe that he could have convinced Joseph to continue his Hamon training and exercises to slow his aging process.

Probably not. Young Joseph is a lazy bum, older Joseph is too old to practice hamon, and senile Joseph is pretty close to going to [HEAVEN].