Character is 57. Too late for kids?

First ever playthrough. I didn’t do a lot of things with this character that I should have, like maxing out all the warrior skills and ignoring leadership etc. never even looked for a wife because I was just having fun being merc/vassal. I do have a 20 something nephew that I’ve been selecting the right skills for. Should I just retire and take over as him? Or as it still possible to have kids at this age?