I think that in-vitro is okay for a young couple in child bearing age. However, I don't think that a 62 year old woman should be having this.
Hey, if her other children are healthy and happy, why not? My grandparents were healthy and vital into their 90s.
My mother's doctor is amazed by the fact that she's still menstruating and (theoretically) fertile in her 60s.
My wife's great-grandmother was married at 16, had her first child at 17, and her sixteenth at 48. 12 of them survived to adulthood. She lived to be 90.
With the above noted exception, both my and my wife's families (Northern Europeans all) tend to have small numbers of large, healthy children very late in life.
A generation in our families is 25 or 30 years rather than the accepted figure of 20. Long lifespans, long fertile periods, low fertility rates- I think we're decended from Elves.