I'm almost 54, have been in this relationship for 7 years. My SO has 2 daughters age 11. We all live together in my house. She pays me some rent and we share a credit card that we use for food and household items. 
we had been living together partly for 3 years but full time now for 1 1/2 years, and through covid. It's been hell. I can honestly say I do not like having kids. But I love my SO, the BM, but hate the living situation. We are not married, mainly my choice, and she has recently paid off all her debts and got a huge raise at work... makes WAY more $ than I do.