I haven't but I know guys older than you that have gone. I know guys close to my age who have just gotten their degrees. I've read that with as fast as the economy changes these days, people may have to go back to school several times in their lifetime to change their area of expertise.
I say this in case you are feeling embarassed about going to school at your age, which you shouldn't. If you're just asking because you want some tips on how to take advantage of your situation to pick up college girls at 38: Never mind.