I'm 42 and shave my penis and balls regularly. Even now I find I have a red rash like series of dots across that area. Usually calms down after a few days with the help of a moisturiser or a skin lotion.
This weekend I decided to get myself really smooth down there ready for Valentines and bought some hair removal cream. I covered my whole genital area, left it for the recommended time and rinsed it off. Yes the hair did just fall out and the area was lovely and smooth. Then it started to burn. Really burn. A lot. I washed carefully, put some cream on it and went to bed. I was awake all night with the pain. I looked like I had bad sun-burn all over that area. I've been putting after-sun on it for few days and it's only this morning it's starting to look normal again. Got nowhere last night, didn't want to show my girlfriend what I'd done. I'll stick with small scissors and electric shaver form now on.