Excessive masturbation can lead to:
1) You calling or naming your right hand
your wife or your left hand your mistress?
2) You preferring to use your hand than having sex with your
gf/wife
3) As far as I know, new sperms in your sac can increase the
fertility and heighten production of your sperms ie fresh sperms
can swim faster and more lively as to a 1mth old sperm.... and your
balls starts to think you're impregnating lotsa women, so it starts
producing more sperm
4) Lost of hair? unless you're a sadist and like to use your left
hand to rip your hair apart while wanking with your right
hand.
5) Excessive shots into the eye. There's a story going round about
a guy who loved to cum onto his gf's face and how one day he cummed
into her eye and it caused an infection.
6) Yes of course you will grow older, each time you masturbate, the
clock does'nt stop ticking does it? 
But it becomes a real problem if you start to love your hand more
than your gf/wife. Boy, will she be pissed!
Have you started to talk to your right hand yet? Calling it a pet
name? or buying extra lotions or oils to make it smooth?