when too old

[Chez]

Jack Leslie, raver and night clubber , in his mid 90's.
Celebrated his 85 th birthday in Ibiza (clubs).
Celebrated his 95 th birthday in "The Mex" nightclub Monaghan.
Most of us have a ways to go yet to rival him.
If you're feeling energetic and with time on your hands Google "Jack Leslie Monaghan nightclubs".

Oh I know of him, he wasn't right in the head they said

[nonpareil]

At 98 he's lucky anything In his head works.

[nonpareil]

I saw him on television a few years back.
Eccentric would be the word rather than not right in the head.Some ancient guy "clubbing" is going to look a bit strange one way or another.
He reckoned dancing relieved him of some depression he had.