How did it get this late again?

Okay, I just received an email detailing the events for my 20th high school reunion.

20 years since I graduated from high school?!?

Where did the time go? Time dialates and constricts, right? It doesn't necessarily progress in a linear fashion? 'Cause I think I missed something.

This is supposed to be a mile-marker and I haven't even been watching the road.