Ooh, that's a good point, actually.
But presumably, with the question OP is asking, it wouldn't be asked by anybody who was already a maman (ou papa).
You're hardly going to ask if you're 'too old' to be a parent without giving the age of your existing child(ren) if you already have them. I mean, you're absolutely not too old to be a parent at 95, if your children are in their 60s or 70s!