it sounds like he's found a good woman, and I don't think it matters who he's dated in the past, or what color skin they were. I think a guy gets to a certain point where he wants a good woman, not just one who looks a certain way, but is the entire 'package' of someone he could fall in love with and have a future with.
Sometimes you don't really know who your "type" is until you meet that person. I think people are too hung up on putting labels on people. None of us knows why we're attracted to someone .. it mostly just happens when you meet them.
I think people get less choosy when they get older and frightened of being alone.
Based on my personal experience I'd have to disagree with you.
I have many older friends who lower their expectations when looking for a partner as they think a) they're older, they can't afford to be picky and b) they just want to find someone quickly before it's too late.