I don't see anyone in this thread discussing sleep. At least anecdotally, I know a lot of people who get worse sleep as they get older. Sleep quality is, if I'

I don't see anyone in this thread discussing sleep. At least anecdotally, I know a lot of people who get worse sleep as they get older. Sleep quality is, if I'm not mistaken, at least indirectly correlated with memory. So it seems reasonable to believe, in addition to everything else people are saying here, that one possible reason time flies by is that we don't get the sleep to make those memories stick.