He needs a new sports jacket.
He's constantly traveling, so a new set of luggage tags will be a perfect gift.
For your brother who is a reading machine, gift him a book of the month club subscription.
He'll love these wool running shoes.
He never gets sick of iTunes gift cards.
Because he and his wife are globetrotters, this is a must. (It will also make an excellent coffee table book)
To go with his record player, gift him with the Vinyl Me, Please subscription.
And even though he's in his thirties, he will never outgrow The Simpsons.