I don't know, and think likewise about 2-yr-old birds as well.

Here's how I look at it:

A jake is like a button buck;

A 2-yr-old young tom is akin to a 2 1/2-yr-old buck;

A 3-yr-old Tom is getting there, more like a 3 1/2-yr-old buck.

Why would anyone want to shoot anything less than a mature Tom?

But shoot what makes YOU happy.    

Mature Bucks & Mature Toms make me happiest.