I am with Vass on this one, though I don't share his experiences.
My parents had me late in life, too late to live long enough to see the next generation (though I started late there myself anyway). Age is a number.
Now, the question about paternity is valid, but as to the rest of it... my godchild was born in circumstances that make it clear that her mother's husband wasn't her father. Didn't stop ANY of us from loving the child and doing our best to take care of her. The point being that if there is an extended family that grew up with love, the little one will not be alone. Extended families take care of their sibs and half-sibs if there was any love to be had at all.
As to whether it was love, lust, or something else entirely, who's to say? But do I remember that Cary Grant fathered a child by Dyan Cannon when he was 78 or 79? I have no doubt that the child lost his father before he was ready to lose him, but that is a choice we don't get to make.
Finally, I'm not religious myself, but isn't there a religious admonition to go forth and multiply? Also... wasn't Joseph already "mature" when Jesus was born to Mary? What's up with age numbers anyway?