Several companies have changed policies requiring you be 21 years old to buy firearms.
I am wondering if refusal of service of persons under 21 s similar to a baker/florist refusing service based on religious beliefs?
Question: Can private companies deny buying firearms for persons under 21?
As the comments suggest, "too young" is not a protected class.
As another example of this principle, most car rental companies (if not all) will not rent to anyone under 25 years of age (regardless of their driving record or insurance status). This is not a legal restriction, but a standard industry practice.
Companies can legally claim that they believe any kind of fiction about their customers if it's not explicitly illegal to do so. If they think that being below a certain age makes a person too young to have a good judgement, they don't need to be correct about it. They can act on that opinion (and lose business) as they please.
The only Federal discrimination laws apply to employment.
The famous Colorado baker lawsuit was based on a state law that prohibits businesses from refusing service for certain reasons including sexual orientation but not age. The baker is challenging the ruling saying it violates his first amendment rights and the Supreme Court agreed to hear the case.
