> At 43, having kids is harder for women, but usually not for men (well, at least making babies: bringing up kids does get a bit harder as you age regardless of the gender).
And regardless, do consider adoption, even as a single parent. There are loads of kids taken away from parents who for whatever reason can't really care for them. Often there's a generational component: the kid's grandparent abused or couldn't support the parent; the parent ended up in foster care, exited out of the system at 18 with no support network, got pregnant, and can't really support the child. If they're not placed with an adoptive family, they spend the rest of their lives in foster care and repeat the cycle. You can make a world of difference.
My first marriage took a long time to resolve itself; by the time I married again, and we figured out that we were having fertility problems, my wife was "over the cliff" fertility-wise. We adopted a little one and he's been a real joy. You are wired to connect with children, and children are wired to connect with you; those circuits in your brain can't read DNA.
Obviously you need to get your own life sorted out first: lack of work and depression feeding into each other are major contributing factors to the problems the kids' biological parents have taking care of them. But get your head in the right space, a good support network around you, and a steady income, and there's no reason you can't be welcome a child into your family. Obviously having a partner can make the burden easier, but there were plenty of single-parent adopters in the "cohort" going through the adoption process with us. It's definitely do-able.