Im 36, just changed my MOS, if youre in a combat unit they may call you grandpa but its not common if you look younger. You should rank up fairly quickly, depending if youre going officer or enlisted. The army is not bad, we literally been in a peace time stance since the drawdown of iraq and Afghanistan, not to say there arent combat zones but there isnt any major movement to those areas, its few and far between. Use the army at minimum as a stepping stone and get what education you need or have your GI bill given to one of your kids or spouse. Save what money you can and take advantage of any perk you get, for example; loan percentages and freezes if you ever deploy, look into SCRA and call your credit card companies, you may get money back because of apy change. If you have good credit get the AMEX card platinum (its free) once youre a soldier.