I would like to know why you want to abstain for such a long period of time?
I hope it is not becasue some adult that is "getting it" regularly is telling you it is best to "stay pure."
It is a biological fact that men are at their sexual peak during their late teens through early 20's. We are "designed" that way and any attempt to thwart it is actually against nature. [soapbox off]
Philosiphical and religious issues aside, I am going against the grain here and say that the older you are the more important it is to have regular sex. Again, we are sexual creatures and we are "meant" to have sex.
If you abstain for long periods of time, especially if you are age 40+ your prostate will develop problems. It is also scientifically and medically proven in recent years that men who have more orgasms are not only less stressed but live longer and have less incidence of heart problems.
Perhaps you have heard people say "Use it or lose it?" Regular erections are the body's way of keeping your penis "in shape." It is even possible for it to shrink because it looses its elasticity. Some may argue with this because it is a minute amount but it is a medical fact.
Finally, if you "train your brain" to not want to have sex by ignoring your natural urges, those urges will, over a long period of time, also diminish. And they will be a lot harder to get back!
So, get out and have fun while you still can. If you don't, some day you may regret it.