As there is a restriction for when you're allowed to have a baby (in norway: 16 years old) I honestly believe there should be an upper limit as well (I have no idea what it would be tho). After the woman's age of 25-30, the risks of any damages to the little one increases dramatically. After what I know (I'm not scientist or know-it-all on the field, however my old science teacher told me that
the best age for having children was when the woman is between 16-20 years old. I'm thinking someone who's over 50 will put a lot of unecessary risks on the baby, as there will be big chances of disnormalities when it's born.
The fact that the kid will lose his/her parents while he's/she's still young isn't really a problem. Of course it's very sorry for him/her, but it's something one can get over after a litte while. It's not a permanent problem... If it becomes a problem he/she can get help to put it behind him/her.
I dunno really. It's not the issue I've digged myself the most into. I'm saying no, because of the risks, however, I think she's entitled every right to have a baby. Adoption is a superb alternative!