How do I stop the aging process?

Humans with out medical help would only live at best till forty. Technically your nearing the end of your life (As far as evolution is concerned). What is wrong with you is that your genes have been programed to give you gray hair early, but that does not mean your growing any faster than anyone else (Aging is not a disease, you can not prematurely age- there is no such thing except for an extremely rare genetic disorder that you do not have). Talk to your doctor if you are really concerned, but otherwise you just have sucky genes, get over it. Modern society has allowed bad genes to be ped on, and now your paying for it.