unless you get hit by a bus

That's an interesting way to gage body strength. I have joint hypermobility that interferes with my ability to balance which is just as well, because I wouldn't want that clock ticking away in my head. On the other hand, it feels great to be building up my leg strength again after my knee surgery earlier this year so I get what they mean about that.

At sixty five, I managed thirty seconds and then got bored.

But then I had a bright idea. Why not stand on one leg, and read Agnostic. com at the same time !

I teach exercise classes for the elderly and I include balance exercises. We use a chair and its there to hold onto if the participants aren't confident with their balance. I see that most of the participants do have trouble with their balance, I tell them to do these exercises at home too

Could be!

At 68, I can stand on one leg for longer than 10 seconds. On both legs.

Some of us might die from the fall we take while tryng to balance on one leg. I used to be a jock but now I'm an old man with neuropothy.