[Iceman]

I've been doing a rewatch of DS9 and Voyager this month, trying to do it in about the order they aired. In one episode when O'Brian is injured someone tells him that he's going to make it and he'll die in his bed at 140. Makes sense people would live to be older with all the medical tech but who knows. Some episodes go 20 or 30 years into the future and the characters seem to have aged a ton.

A lot of things in Star Trek don't get explained in too much detail, likely because they don't want to have to come up with answers. Like the lack of currency for the Federation but people still work crappy jobs or seem to live a wealthy lifestyle. Or travel times and distances not always making sense with the information given. That's all minor stuff in the end though.