I think my boss is a ridiculous aged man acting like a kid
Why would you say he's a man-child?
He thinks he can have any woman who's within 20 meter around him
You shouldn't judge him since your boss is just trying to show off that he still got it. He is boosting which can come off as childlike especially when he is old and just want to try to impress others. Who cares what he thinks because others will think you are judgmental for making a big deal out of it.
I'm reporting him for sexual harassment for putting the hands on the female employees.
If he actually did that, then I think it's good to report. But otherwise you shouldn't just sit there and judge him for no reason.