Dear Dr. Beth,   I am in my 50s and my fiancé is in her late 40s. When we first met almost two years ago we were very attracted to each other but both of us wondered if our life experiences and backgrounds would really make us compatible enough to have a serious relationship.  Our relationship has turned out to be great and we are planning to get married. However, I’m still worried about our differences getting in the way of a long-term relationship.  For example, she doesn’t have children and I have children and young grandchildren I want us to be involved with. Also, she has been single most of her life and I was in a 30 year marriage. Her friends include several former boyfriends and my friends are all long-term married couples. Are we on the road to trouble down the line?