Talk:Morning Musume/@comment-110.32.27.229-20141203140131/@comment-24833026-20141203230456

I'd say new era ever 4 gens

example

1st,2nd,3rd,4th = golden era

5th,6th,7th,8th = platinum era

9th,10th,11th,12th = colorful era

13th,14th,15th,16th = ???? era