Depends
My great Aunt and Uncle came up for our wedding party last week. They're both in the 90s and about to celebrate their 60th wedding anniversary; still travel and apart from a bit of arthritis and slightly dodgy hearing are in good health.

I wouldn't want to go too young; at the same time I don't want to end up a dribbling burden.

I'm reminded of Sylvester McCoy, whose Gran reached 100 only to find that she had outlived all of her friends and most of her family. Had never drank or smoked in her life and took both up with gusto. Lasted another 3 months...
( Davros' Granddad a voice of calm reason in a world of spastics., Mon 20 Apr 2009, 22:46, Reply)