As someone close enough to 50 this would really freak me out if that was actually a thing. Personally I wouldnt even agree that 50 is that old either. Also what your saying is that basically nobody would have their parents in the later years of their life, hell the way times are changing i know a lot of people who have had kids over 35 so your saying their kids will lose their parents when they are like 10 years old. I still have my grandmother and its still amazing to see my parents, their siblings, and my grandmother which by your question would all be long dead. Also fyi none of them have anything awful health related yet either, hell my 87 year old grandmother still drinks some beers with us when we get together and loves a good IPA or stout.

Considering my life stopped getting better at 25 and I am in a financial mess right now, i am totally looking forward to retirement and my 60s to enjoy the last years of living and to finally stop working for the first time in my life since ive been 15... im looking forward to that.