I'm a strange creature,
Often misunderstood and moody,
I come in 2 'types',
A vast majority of my kind is part of the first type,
Energetic, enthusiastic and eager to learn
With this type comes short lives,
A decade at most,
But almost all of these will make it far enough for them to ripen and change flavor.
A tiny minority amongst us, 'type 2'
less than one in a thousand, is fundamentally different,
relatively well grounded and more mature, Even as young they feel superior, for they live lives far richer and longer,
Most of these live up to thirty years, some even up to forty.
Now the odd thing is that amongst these long lived type twos, less of them will ripen and change flavor then of the first type. Altough some will try to claim that they were born with the right flavor already. But I insist that's not how it should work.
So what kind of creature are we describing,and what are the 2 'types'?
I figured i'd start giving out some hints, will add a few every 24h :P
Some of these, regardless of type, would be offended if you called them a creature, prefering something that sounds a bit more civilized.
Type 2 actually occurs 1 in 1506, altough most falsely estimate it to be 1 in 1461.
I'd like to add, like I did in the comments, that if you have the right answer, you will know it. (And perhaps develop an urge to hit me)