My mum had both parents alive and in good health until she was about 60. Sadly she died herself aged 66 (my grandmother outlived her). My BIL is 62(3?) and both his parents are alive.
I do know a few other people. Not all that many, but that's largely because most of my friends are under 55 and with acquaintances, colleagues etc it is hard to be sure either of age or parents!
I'm 50 and there has been a huge change just in the last 2-3 years. Previously most of my friends my age still had both parents living. Now it the minority I think. Most have one parent still alive.