Yes, you can certainly have endometriosis after that.
Having children is good, because the hormones of pregnancy help allay the situation. You may have an asymptomatic situation if you're lucky enough to get pregnant.
Of course, you can have endometriosis in your forties. The good thing about menopause.... It doesn't often start after menopause. It's the continuation when it gets severe. It causes the menopausal situation. Then it's very hard to treat the menopause because of the endometriosis. The key years are 20 to 30. That's where you have most of your endometriosis.
We would have diagnosed you. You should have come.