I personally don't agree with the concept of 57 year old people having kids. I'm not just talking about mothers here, but fathers too. The only reason the old mother issue is coming up lately is because technology is now enabling older women to have kids whereas it was never very difficult for older men to father 'em. At any rate, I don't believe it's especially fair to the child to have a parent who's so much older than all the other parents, who will die when the child is younger, and who will also require assistance from the younger child as they grow elderly. For some, the necessary emotional development will not be there.
For most of these older people, they've either misspent their youths or used up their normal parenting years in the pursuit of other goals and only later in life did they realize they missed out. Well, tough. You already spent most of your life unwilling to sacrifice for children and then in continued pursuit of your desires, you'll force your children to sacrifice for you. If you missed the boat, let it go, accept it, and don't think that you deserve to have it come back to dock for you.
Related to this is a study the CNN article mentions:
Researchers say older parents have some advantages. A study of 30,000 households showed that people who had children in their 40s were better off financially, spent more time with their children and had a closer connection to the children's friends than younger parents, said Brian Powell, a sociology professor at Indiana University.
Now I'd be interested to see this research, which it doesn't reference beyond this mention. It depends on what parameters they're using for being parents. Also, while 40′s is pushing it, it isn't too bad. I'd also like to be assured that this isn't a case of willful sociologists slanting research to validate what they think should be socially acceptable but isn't.