No, but if you're not, it can hamper said parenting significantly.This is her choice. I don't understand WHY a woman at her age would want to have children but I don't think you're going to see 65+ women beating down the doors of the invitro clinics.
There are plenty of older parents and grandparents who are raising babies and doing a great job. Younger, stronger, healthier does not necessarily equate to better parenting.
Everyone is picturing a decrepit, doddering old lady who can't find her teeth, much less take care of twins. Yes, there is the possibility that she will not see these babies into their 20's. But there is also the possibility that she has planned for their future and that she will love them and care for them. They are obviously very wanted, as anyone who has undergone invitro can tell you; it isn't an easy road.
Every child should be wanted so badly.
We were desperately wanted, too...when we were babies. My parents were not decrepit and doddering...that had nothing to do with it. I won't likely be of the same energy level when I am nearly 70 as I am now at 40. I can't even imagine raising twins and then teens--I sometimes don't have the energy NOW!
There are legitimate questions regarding the wisdom of a 67-yr-old woman raising twin newborns--moreso than not--the scope of which may not be known for many years. Someone said it well when they said it was a burden on the kids. Kids have enough to deal with without having to deal with a septuagenarian parent and all that can accompany that.