Beards.
Some of these guys grew beards as part of the No-Shave November movement. And then just kept them.
Some grew them as a bit of rebellion coming out of high schools with strict no facial hair policies.
Some grew them because they were finally able and wanted to show every other guy they knew that they could (a definite guy thing).
Some grew them because they have baby faces and realized they would look older with a beard.
Oldest (who did grow a beard last winter) says he thinks it is a reverse percentages thing. Because beards are not worn by the majority, they are desirable to a minority who want to look different. We have not yet seen his beard in person, will see him later this summer.
And if these boys have steady girl friends, whom they spend a lot of time kissing, they need to know about rinse out conditioners.
A good rinse out conditioner softens a beard hugely (and prevents beard burn on their girl friends).
Beard burns hurt (and show).
It is news to most younger guys that they need to condition their beard to protect their girlfriend's skin.