I think it boils down to what is acceptable in our Western world view regarding families. It's quite alright for late teens and early twenties to have children, though those age groups stand at the highest risk for divorce and nasty custody battles. I know there was some mumbling on my mom's side when she and dad married (he was 36 at the time and mom was 25), and had children between the ages of 37 through 45. He still is living, as is she, and both enjoy their grandchildren. Odds are, with the great strides in medicine, though he's now 74, he'll probably be around for greatgrandchildren.
As for the articles, it is not clear if the daughter or son was the mother's own offspring, though the second article stated she had a history of failed pregnancies. From her statements, the assumption is that the donor family (her own family) was not tied by blood or genetics to her. The more jaded side of me was that this was done solely for political purposes and gaining an entry into the record books.