The first time I felt old I was 28. My oldest son was 9 and started playing football. I tried to keep up with him running and throwing and stuff, and came home that night feeling like I'd been beat up by LA cops. The rest of the 20's weren't so bad, didn't pay much attention to birthdays until I hit 30. 30 was a little rough, mainly because that's when I first really thought of myself as getting old. There was a time in my life where I really didn't think I'd live to see 30. Now I was here.
33 would have been the most recent hard birthday, and the reason may sound strange, but that is the youngest I remember my Mom being. I mean, I was only 8 or so, but I remember her 33rd birthday pretty clearly. So I've now made it to an age that my mom was once. Scary indeed. I'm really not looking forward to 40.