Marcus you have absolutely nothing to worry about. I'm 35 (and a half!), been playing for a year and a half and I'm not fit (by any stretch of the imagination
) but I can hold my own on a paintball field
My fiance Lump is a year older than me and has been playing 4 or 5 years. He's not nearly as fit as you seem to be but he plays div 1 and is a class player with many years left in him lol. You'll be fine
Good luck, can't wait to meet you on the circuit one day. Feel free to come and say hi
Lemon x
p.s. I played against a team mate's grandad at Millenium and I think he's over 60...we lost lol!