I'd like to think it isn't, but I just feel like it is. I've got children and my full focus is on them.
There's no way of knowing, and you're right to focus on them. But you mustn't feel that it won't happen because you're too old. We all know lots of people who fell in love in their 30s and beyond, plenty of people who met their second spouse in their 50s and later, and I personally know two couples who met in their 70s.
So keep on keeping on, but never say never. And you are most definitely not too old.