I do 1-2 sets of 15 "knee" (or "girl") push ups 1-2 times a week at the gym. I remember reading that most 35-year old women couldn't do 15 knee pushups, so I felt compelled to try and beat that (I'm 47). I'm scared to even attempt the full push up, but I will! I suspect I'll be starting at Level 1 with a bunch of you. 
My DH will absolutely *die* if I make it to 100 push ups!
...then again, I might too!
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow