Golden oldie

A golden oldie is a old person. Typically old people are weak and has limited mobility but a golden oldie is the opposite. Even if they are old they are still very healthy and is still successful in their field. You use this word for people who are no longer young but still successful.

Note: Calling an old person "oldie" will sound disrespectful.

My Grandpa is a golden oldie, he still plays rugby at the age of 77

Buffon still plays football at the age of 45, he is a golden oldie