Can be done. My best friend in college, and best man at my wedding, had a big time falling out with his girlfriend at age 35 (the thing that finally convinced him was her calling the cops on him), decided he needed a change of life and went into the army. He survived. They sent him to language school and taught him Russian (this was not long after the global monolithic communist menace finally started to crumble). After all that, they set him to fixing trucks. He also fell in among Jesuits, but that's another story.