What age does "hormonal behavior" kick in

[BellasMamma]

I see post on signs of this...trying to burrow, kicking feet, nipping, etc...but is there an age where this tends to start?

My Bella is now almost 17 months old. We've only had her since July 23rd, so we're still learning her behaviors, and she us.

Thanks,

 

[Oedipussrex]

Well a male ekkies beak wont necessarily be completely yellow until 3 years, which i guess is considered 'adult' (although some can be fully yellow before you even get them from a breeder at a young age).
Pickle has not shown any signs of hormonal behaviour yet, and he has just turned 2, though i was warned that it can occur at 1 1/2 - 3 years...

I never really managed to find any consistency in my research, and 2 years is a pretty big inconsistency, sorry i cant be much help.