Lots of <60 retirement goals. Which is awesome.
However, I think life expectancy of the population is decreasing, but I feel like there's probably a correlation to those in the position to retire at 55 and people who are benefiting from the increasing knowledge on health & wellness & the self-discipline to capitalize. Coupled with improving health care technologies, and I feel like being reasonably active @ 95 years old and living till 105 isn't out of the question as "normal" if you're currently in your 30's or 40's.
So if you can do fun stuff till your 90, and live past 105..... Would you have enough money? Or alternatively, and honestly a bigger concern for me, do you have enough hobbies/passions to fill the time of a 60 year retirement?
tl;dr question: What age do you assume you'll die in your planning?