"Saddling a teenager with a 60+ parent?! Age really isn't what it used to be. I have a friend who is 61 and she is really active and still working fulltime and lots of hobbies and yoga and gym. Poor teenager being stuck with her as a mum"
For me, it's not so much the teenager with the 60 year old (although this really did affect my DH) its the fact that by the time we had children, my FIL was almost 80 and not really able to have the relationship I had with my grandparents.
I'm 30, my mum is late 50s, we still do a LOT together, she has a great relationship with my toddler and is still very active. But if I'd left it until mid 40s to have children, she would early 70s and realistically will have less mobility and less years with us.
There are pros and cons of both really, I had DS at 27 and will be 30 in a few weeks when this one is born. I'm lucky we're financially stable but I don't feel I've forfeited my social life to have children. I've temporarily thrown my career under a bus but that would happen at any age if you want to have children - in my profession it's easier to pause as an associate level rather than a director.
The arguments for having children later on seem to hinge around financial situations which is only one consideration for having children. I will say as someone who has had multiple miscarriages, the prospect of the complete and utter heartbreak is really being played down in this thread. I know it's not really considered until it happens to you, but the toll it will have on someone's mental health can't be dismissed out of hand as it (IMO) affects every aspect of life.