My dad just turned 80 and we had a big party to celebrate in NJ (which is why I'm writing this from my plane heading home). It was a beautiful party and my dad is in great shape for his age, but I still can't believe he's not the young guy I remember from my childhood wearing tennis clothes, driving a Datsun, and sporting a big a mustache. Time has gone so fast.
This is why I believe so strongly in milestones and celebrations, even little one. It's a way to stop and enjoy the people you love, before life moves on.