When do you get a nose?

[Det. Sandy Vagina]

Puberty?

[almyros]

you're born with a nose

[Det. Sandy Vagina]

I wasn't.



Nor were any South Park kids apparently

[Big-Will]

Puberty?

Yes, unless there's a need for it, like in "Good Times With Weapons," when the boys appear in anime form.

[Det. Sandy Vagina]

Well, they are adults in their anime form

[Big-Will]

Well, that confirms it: you have to be at least a teenager, or pretend to be an adult anime character, to have a nose.

[SouthAl93]

Well, that confirms it: you have to be at least a teenager, or pretend to be an adult anime character, to have a nose.

But are the kids still able to smell?

[Det. Sandy Vagina]

Children probably just have super small, almost invisible noses. Like anime chicks.

[Big-Will]

Well, that confirms it: you have to be at least a teenager, or pretend to be an adult anime character, to have a nose.

But are the kids still able to smell?

You ever watch "I Should Have Never Gone Ziplining," "Towelie," or "Spontaneous Combustion"?

[SouthAl93]

Well, that confirms it: you have to be at least a teenager, or pretend to be an adult anime character, to have a nose.

But are the kids still able to smell?

You ever watch "I Should Have Never Gone Ziplining," "Towelie," or "Spontaneous Combustion"?

Yes, yes, and yes.

[Big-Will]

Then you know the answer is ... yes.

[JVM]

I believe the characters' noses begin to appear in animation when they're teenagers, around fifth grade.

3rd/4th Graders: Virtually no visible noses or ears, except in some very exceptional circumstances.
5th Graders: 10-11. Inconsistent, and even otherwise consistent recent portrayals (Tammy Warner, Mike Makowski) have varied on this particular issue.
6th Graders: 11-12. They almost always have noses, except in the Unaired Pilot, but those same bullies end up with noses in the show.
7th Graders: 12-13. Shelly and presumably Kevin McCormick's grade. They are not seen with noses. Shelly's friends, however, do have noses, so they may be exception more than rule.