I don't know if it's just me, but it seems like when you have kids, time just whizzes by in the blink of an eye.
I'll often look at my ten year old and think, how is she ten already, it was 5 minutes ago she was a baby.
maybe just that kids keep us so busy it makes time fly faster , although quite often if someone talks about an older film, like the matrix or something, my initial reaction is always surprise when i think, oh wait, that was literally like 24 years ago.
will need to check with the child-free people, but maybe the passage of time just increases as you get older, period