Well, several reasons. 60 is too old to have a kid, as the father will be 78 when the kid
turns 18.
I actually know a 58 y/o who married an Asian woman and has a four year old daughter. He is
proud of his "achievement" but he is in fact a laughing stock with some ex-pats.

I have a friend in Phuket who is about to become a father again at the ripe old age of 65. He seems happy about it, but when the child is 18, he'll be 83 - if he's still alive!

Some Asian women seem to have this crazy, almost innate desire to bear a half-breed child.