I always say age is just a number (apart from illness like arthritis) which would at any age stop your progress..
Im 50 nearly 51 in a few weeks and ive just recorded this video of me learning to play stood up, its harder to play standing up for some reason. Ive been playing about 5 months if my memory serves and ive never had so much fun :-)
Age is nothing really if you have the interest, and lets face it, when you get older you stop chasing women so much and have less distractions, well apart from my grandkids going "giss a go grandad"..
Grrrrrrr :-)
http://www.youtube.com/watch?v=tADV5lk-7Dk