100% agree.
I am late 50's with a fit, energetic husband nearly 4 years older than me.
The difference between 47 and 60 is huge.
I can clearly see it in us as a couple of fit people.
Until you grow older, it is really hard to explain and quantify.
Aging creeps up very quietly, even when you are healthy and fit.
Also I think some men get old manish a lot earlier than women of a comparable age.
Whatever about women trying to run around after grandchildren at 50, and finding it exhausting, first time fathers of that age often aren't able to adapt and leave it to their partners to carry the load.
I've seen it first hand, they may like the idea of it in theory, but the reality is just so different.
My husband had a few colleagues in this situation.
They had a blast working, travelling, living it up for decades, then decided a family was a good idea in their late 40's.
Met much younger women in their 30's and because they were so solvent and charming, sold them on it.
All have had a couple of children quickly together, in their early 50's but seemed to age over night.
Being 60 with pre teens to rear is no laugh at all.
When I have come across it, it is absolutely the women who carry the rearing as the men are just not able energy wise.
Of course people will suggest I am generalising, ....and I am.
I am giving my general experience!
I'm sure there are exceptions out there too, but I just haven't come across them.
These much older dads are like grandads, while their wives very much keep the show on the road.