Things can become difficult at any age for many reasons.
She clearly is not 'too old' - she is of natural childbearing age.
There is some ageist judgmental crap on this thread.
Any individual may feel that they are personally too old (or too young, or too poor or too single etc etc) but that doesn't mean that someone else does.
It is not the norm to be decrepit at 70 - I am an older MNer and none of my friends have become the sandwich generation until the parents were mid 80s or older.
The toughest things I have seen are women aged 40 or so getting breast cancer with primary aged kids (so having had kids early 30s) , developing MS ditto. Should people refrain from having kids 'just in case'?
Hopefully the woman in the OP now has a stable, mature relationship and her child will grow up without divorce...which can happen to a woman who has a children at any age.
Everyone I know who is in their 60s is busy hiking, camping, travelling, still working full time, cold water swimming, going to the gym.....
I wonder if younger mothers are thinking about having a baby as an older Mum from the perspective of 'starting all that again', having been worn out by child rearing?
I had a child at 43, it was no hassle at all.