I think its wrong purely because my nana died when she was 66 and a year before she was in fine health so anything can happen so thats just a personal view to me. But most people die between 70 and 80 so she might not even see the baby make it to be a teenager .........
If the 66 year old has adult children though then I suppose it softens the blow a bit ... but should people even be having sex at that age anyway?