I think people also need to consider the children as they grow up and the impact this has on them.
There are a lot of posters on here who talk about the impact of having elderly parents, if you have babies at the age of 40 you will be elderly before those children reach the age when you had them. If they then hold off until their 40’s to have children you will unlikely be able to be an involved grandparent, in fact I think that the fact people are having children so late now means we are going to end up with an age of more or less grandparentless children.
My parents were young when they had me and my sister, early 20’s but it meant for them that they were in their 40’s when we were grown up and they were free to do their own thing.
I’m in my 40’s now and my parents are in their mid 60’s and still very active. Me and my sister had children in our late 20’s/early/mid 30’s and our parents have been able to watch their grandchildren grow up and the grandchildren more importantly have been able to get to know their grandparents.
I don’t live locally to my parents now but they are able to still drive to see me, and I have had some major life issues which my parents, esp my dad as he’s now retired, have been immensely supportive with. Now I’m in a position of thinking of moving back in a couple of years so I can be there for them as well as they grow older and my dc will have left home by then.
My eXH’s parents are similar age to mine and were fully involved with our DC. They didn’t live locally but DC were able to go and stay with them over the holidays etc and they took them places and so on. They can still do that as dc are in their teens so they are less dependent. However eXH has a young toddler now and they are unable to have that kind of relationship with him as he’s still too young to go and stay there and by the time he is old enough they will be to old.
Similarly eXH’s partner has older children who her parents were very involved with as she was growing up. Again, used to have her to stay for holidays etc to give her mum a break as she was a single parent. Now they’re elderly (they were older parents anyway as iirc shes the youngest or second youngest of a few children and they had her older) one of them is in extremely poor health to the point he has become housebound in the past couple of years and they are now unable to have much to do with the younger DC because their health doesn’t allow for it any more.
This means that the younger DC is missing out on a relationship with grandparents on both sides which does exist for the older DC who were conceived when their parents were much younger.
Obviously poor health can affect anyone at any time as I know people do often state on these threads. But old age is a reality for everyone and although people are living much longer now, many of those people are still in poor health by the time they reach severe old age.
As a child it might not have bothered me if my parents were in their 40’s. Children know no different. But I would be devastated now if my parents were in their 80’s and heading towards the end of their lives.