ack!
I read that she was 6 months younger, not six years! That mades things make a lot more sense!

I think the answer to you question is MLC. Betweeen his age, young kids, and a ridiculously young girlfriend, it seems to fit.

For amusement: http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=1018599&site_id=1#import

And for more information:
http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=657119&page=1&fpart=1

His brain isn't working right, is the short answer!