Haha.
I think the big attraction is more for the guys who are 60 and can get a girlfriend in her 20s or 30s, or just date around in that age group.
Relive their youth, or live the youth they never had.
Otherwise, what you getting at 60 in the West?
I'm middle aged and I've got 20 year olds interested in me, lol, but even the 30-40 year old Thai birds are still in good shape.