She seems to be over the moon. He has 4 other children too. I worry about her. Give it some time before hell breaks loose I'm sure.
I'm glad she is happy now. Maybe in spite of the age difference he is a good man and treats her well. But I am skeptical. I always feel bad for people who think they are happy in bad situations. I wish there was a way for them to know how much better life could be if they just waited through the bad. (Not saying this necessarily applies to your friend, but it could).