I think if you're having your first and only at 41, you don't know any different.
I had DS at 26 and DTwins at 37. Jesus H. Christ. The difference. Toddlers in your forties are not fun. I know I've got twins, so that does skew the comparison a bit. I'm very fit and healthy. Probably more so than 99% of people. And I'm knackered.
I know you'll get the people saying how they've had triplets at 52 and are running the marathon, (well, you get the idea) and whilst these people may exist, they are the exception, not the rule.
For me, there's nothing in the world that would make me have another child now, at 41. I've shed a tear several times that if I died at 75, DTwins would be motherless in their 30s, and whatever happens, I will likely not survive my grandchildren much past their primary school ages. But then if I was desperate for a child, with no other children, I'd be none the wiser and going for it.