User blog comment:Epic~00/Epic Analyzes: Possible Returning Contestants/@comment-28084190-20160330130600/@comment-11883116-20160330201749

Actually, since the first generation is 19 years old as of RR, while third is still 16, 16-19 is the age for TD contestants, including the case if someone from RR was going to appear on TD. However, I'm pretty sure they would make an exception for Emma (who's 21) because of her main interaction with Noah. This may as well mean that the age for TD contestants is not only 16-19, but also 16-21 (again, with the only exception so far being Blaineley and that's only because of how she entered the competition).