as in how to stop balding? What you need is a product that removes dihydrotestosterone from you hair follicles. Basically, there are two man male hormones - testersterone and its more biologically active form, dihydrotestosteron (or DHT). DHT pretty much makes you really masculine, but you also have receptors for DHT in your hair, which makes the hair fall out, especially if you have a lot of the hormone or the receptor. Now, if you use a product that removes DHT from your hair, it is very effective at preventing baldness, especially if you use it BEFORE you are pretty much bald already! There is a shampoo called nioxin that does this (not sure how well it works) or many of the baldness treatments available work this way.
With me it depends on how well you take care of your hair. If you use allot of hair gel, spray, perm or dye your hair. With guys, to me it seems easy to take care since you can wash your hair and it dries up fast. Also if it runs in your family, that might be it. But one more thing may be that if you are or have been on medication that is a definite one.
always take good care of your hair as in good hair care products. if u straighten it then make sure you use heat protector things (brain blob i forgot what theyre called) but ur a guy so i dont know if thats your style.
hairfall cant be prevented you loss a BUNCH of your hair everyday but it regrows