Hear what you're saying MWB. The odds on you dieing leaving your children orphans at a young age are stacked against you. Nature understands that and normally compensates by (usually) making sure you can't have children beyond what you're supposed to be able to do naturally.
But on the other hand, these children born to older women are usually much longed for and greatly loved. I'd personally rather see those, than children popped out by virile youngsters who couldn't give a stuff about their offspring.