What time do they serve the jello?

Getting old means time speeds up. The days fly by, the weeks rush past, pretty soon the season you were just getting used to is being replaced by another one.  And before you know it, you’re another year older and deeper in debt. Wait. That was a song lyric. I think. What is this phenom, which isn’t relegated to the nursing home but seems to affect all oldsters? Well, there are theories.