Just musing but I am married too and have children with a man 15 years older than me. It isn't an age gap I would of sought out, no. But I met someone and fell in love.
However whenever I've seen a thread about age gap relationships on here, over the years, people talk about later life. When you're 60 and they're mid 70s. When you're 65 and they're 80. Of course put like that it might sound scary, but it will still be the same person you married. Not some random old man appearing in your home.
This isn't me saying they are perfect, but a look at my close friends, family and threads on here show me that no relationships are. How many same age marriages end in tears? How many men the same age as their partners up and leave them to be a single parent? Cheat on them? Tell them they don't love them anymore?
There is no certainty to anything, 20+ years of a happy relationship/marriage is far more than a lot of people get. Grab happiness where you can.