User blog comment:Lemamamn/WHY SEASON 6 IS OBVIOUSLY FANS VS FAVS/ WHO I WANT BACK/@comment-24259216-20170518192852/@comment-11883116-20170518231245

Actually, the age rule still applies as every new generation was 16 years old in their debut season.

I'm sure you have to be in the first cast's age to compete (16-19 years old). There may be an exception for Emma whose age isn't that much different (21) and who has a relationship with one of the contestants.