[SpecterH]

I think that's extremely inappropriate - for so many reasons that I'm not even going to attempt to explain.

Unfortunately, though, there may not be much that you can do about the situation. You're 13 years old, and I doubt that you'll have much influence on your mother's behaviour. However, I'd recommend that you take your mom aside and talk to her about the situation. Tell her that you feel uncomfortable with the age difference between her and her new boyfriend, and then go from there, see how the conversation goes.

I know it must be frustrating for you, but unfortunately, there may not be much that you can do about it.

Hope things get better; good luck.