sure, lifespan improves, but quality of life does not.

of course there are some fit as fak 50s and 60s ppl, no problem with their daily activity, self-sustaining in all self-care, body OK, mind OK - but these are NOT the norm. If you yourself are, then good - noone cares.

but i can tell you from my unfortunate vast experience of dealing with older ppl (for work- else i farkin hate humans), the generalization of 50s and 60s have greatly diminished physical/mental health or capacity is very true.

Your 50s and 60s is the reflection of your health choices and lifestyle of your 20s to 40s.