Go for it, if they'll still have you. I am 35 (36 in less than a month). Would love to join up, but my wife and five small kids would not appreciate it. In another life, I would though. Was more interested in pursuing "non-regimented" ways of life when I was younger. My co-worker who died this summer was a Marine and I remember being proud of him at his funeral. Those who serve deserver a place of honor (and get it from most).
My wife was lamenting one day that when our boys get older, they could be drafted and die in battle. I told her that there are worse ways to die. There is no greater honor than to have fought and died for freedom. I know that sounds callouse to those who have lost loved ones in to war. But think about it, families who lost their loved ones to war have something and someone to be VERY PROUD of. Compare that to the parent who lost their child to a drunken driver, or a gang-banger or something. Yeah, both parents loved their children and were proud of them. But one scenario is just sad and a waste, whereas the other scenario is something a family can at least honor their child for fighting for THEIR freedom. I hope that makes sense.
Anyways... hope I haven't scared you out of it. Go for it if that's where your heart is.