Hell, I'm not even that old (41), and we had a rotary phone until 1988 or so. We also had a touch-tone cordless phone, but the corded phone in the kitchen was still rotary.
I expect there are even younger people than I who used rotary phones as kids.
That would depend on the country, yet I'd consider late 30s to be the age.
Also I am using the phone daily to call anyone - family, coworkers. It'd appear, around here, the ear buds have not caught up.
Some can, many won't. Eye sight and dexterity problems have a lot to do with this. When you can't see and your hands shake it's a lot easier to just "hey google call so-and-so."