I have a theory about the passage of time. It should be viewed in 12 year increments.
The first six years don't really count--we're too young and we can't even recall much of those first years.
The years 7-18 (1st grade through 12th grade, if you like) last forEVER. They just go on and on. 19-30 are much faster (you're seeing this now), but still--trust me--they pass rather leisurely.
31-42 are much faster. This is when you'll really notice a change, probably, and after that, each 12-year period just gets faster and faster. Now, if I'm discussing a movie I saw a while back or a hit song I liked, it's not just a few years older than I thought, it's twice or three times as old.
Like I said, buckle up.