Makes perfect sense. When we're young, we have plenty of firsts. First day of school. First day of summer vacation. First date. First kiss. First real relationship. First terrible breakup. First real job. First...you get the point. When we're young, life is full of firsts. Time seems to pass more slowly because everything about those moment is fresh and new. But you can't have a lifetime of firsts--at least not meaningful firsts. That's when "different" kicks in. 2012 didn't pass quickly; that's the year I had a heart attack (not that I chose to, but still) and then managed to get in sufficient shape to ride a 100-mile Gran Fondo. (Think that year went by quickly? Ha.)
