Average age of the members of Morning Musume yesterday: 21.
Distribution: 24, 22, 21, 21, 17, 14, 13, 12, 12.
This does not look like a recipe for success to me. The four oldest girls have been in the group for more than seven years, and will have to bend over backwards to not crush the little girls on stage and in public appearances. They know all their lines and dance steps by heart, they have legions of devoted fans who will not be happy if they get less spotlight time, and the competition is much fiercer than it was even a few years ago. It was bad enough when AKB48 and Idoling were poaching their fans, but Girls Generation has been a massive success in Japan recently, making the local talent look like, well, terrible dancers in funny-looking outfits.