There isn't a clear separation between the two tags on the wiki. "young" seems to be an umbrella tag alias attached to the various tiers of underage tags, but "cub" is described in similar terms. Is "cub" the same as "young", but specifically for furries? Seems redundant in that case considering the vast majority of art approved here is furry.
If "cub" should be assigned to a specific age range, could that be clarified on the wiki?

young can apply to anything, cub only applies to animalistic creatures like anthros and ferals

Further, cub is only really intended for characters which appear as children or infants

young applies to characters from baby to teenager and applies to all creatures.

Than there is the shota and loli tags which are only applied to content of sexualized nature.

So a post can sport
shota, loli, cub, and young all at the same time but anything with these tags should be rated at least questionable.

Thus a safe image should never have shota or loli tagged to them.

So the short of it, is that young is an umbrella tag which all tags regarding characters that look to be in their youth

I think elves, faries, cupid, and the like make a notable example of things that could be tagged with young but not necessarily cub. Granted here there are many instances in which they'll be portrayed as animals, but enough of them are mostly human enough for the distinction between cub and young.

Versperus said:
young

cub is only really intended for characters which appear as children or infants

young applies to characters from baby to teenager and applies to all creatures.

Technically incorrect.

Cub is supposed to cover all the way to the upper limit of young, but years of colloquial misuse have entrenched the "cub is for pre-pubescents" misconception to the point that cleaning up (and potentially implementing the teenager tag more) is a HUGE project.
Beyond that basically nobody wants to touch the conversation because cub art.

Relevant thread
NOTE: I started the above thread with that common misconception that cub = prepubescent, then was informed otherwise. Because of this it contains a number of bad arguments.

MagnusEffect said:
Technically incorrect.

Cub is supposed to cover all the way to the upper limit of young, but years of colloquial misuse have entrenched the "cub is for pre-pubescents" misconception to the point that cleaning up (and potentially implementing the teenager tag more) is a HUGE project.
Beyond that basically nobody wants to touch the conversation because cub art.

Relevant thread
NOTE: I started the above thread with that common misconception that cub = prepubescent, then was informed otherwise. Because of this it contains a number of bad arguments.

It supposed but that's not what it is today. I think the Versperus description was pretty accurate for nowadays. If you look for cub now, mostly are in pre-prepuscent age and Young goes to baby to teen, in any species including humans.

I think it's fine the way it is. If you want to blacklist you put young, if you want humanoid you use young -cub, if you want something more animal like you use cub. If you want boys you use shota, if you want girls you use loli.

Basically using one or two tags you can get anything you want. If you were to fix it then 3 would be needed. They are kind of more species (+loose age group) now rather than strictly age it would be with the fix.