What is wrong with my brother and his girl friend?

Yeah just stay out of it.

It's probably a mental thing with your brother, he wants younger women maybe because he didn;t get women when he was younger or he wants to fix her.

They COULD be in love and maybe they both overlook the things we all see as odd because they love eachother and want it to work out.

But its probably the sex and she probably just wants to seem cool ya know dating an older man.

Let him wait till luck turns in his favor again. He should grab the right opportunity whenever it comes. In the meantime, let him pray honestly and sincerely with ardent devotion. Prayer does lot of wonders. Prayer gives moral strength, intellectual brilliance, divine wisdom, spiritual awareness and philosophical outlook. If your brother has that kind of strong willpower, indomitable courage, bull-dog determination and mental conviction, he can win over the whole world. Don't worry. Be always optimistic and rejoice life.

As bad as it sounds you should stay out of the situation. Your brother is an adult and can make his own decisions wether they are good or bad. All you can do is give him advice and be there for him. I hope things work out for you :-)

good question. Maybe she's the only GF he could get? She desperately needs antidepressants. If I were him, I'd insist that she get some or he'll break up with her.