Couples TTC - how much is your age gap, and how old is the oldest child?

My husband and I have a 13 year age difference. He has two children from an earlier marriage, they are 15 and 17.

I don’t have any children of my own, but would like one. He’s teetering over the decision due to his age, and that his kids are almost out of the house. He says he’s too old to have more children.

I’m 35, and he will be 49 in May.

Anyone in the same boat?