Just wanted to put in a word for the numerous 80 year olds who are still very active, engaged, and spending as much or more money on their hobbies, travels, pleasures, etc., as younger retired folks. My 83 year old mother, for example, still spends a couple of months a year on international cruises, belongs to numerous clubs/activities, does frequent 1-3 trips with her senior groups, and has a more active social life than I do -- with these discretionary activities by far the biggest part of her annual budget. Lest you think she's an unusual superwoman type physically, believe me she's an average 80-something and has had her fair share of health troubles -- including a few bouts with cancer, hip replacement, and even going on dialysis last year! None of this has diminished her desire and ability to enjoy her time, and to do what she wants. As she can well afford it, I say go for it!
No, not everyone lives into their 80s or 90s, or will necessarily feel up to pursuing these pleasures at such an advanced age (or will even have expensive pleasures to support!). But I'm in the 'wait until 70' SS camp. Should I be so lucky as to live that long and be relatively healthy, I definitely want the option to spend as much or more in my later years, including for the more expensive additional comfort (e.g., when traveling) that I'll almost certainly appreciate or need at that age. And if I don't feel so great, I figure there's just as much chance that I'll need the extra dough for additional health care costs in those decades. Either way, that's my rationale for waiting to take SS -- YMMV and not for everyone, of course!