Two-thirds of the court, anyway:

Handgun sale ban to under 21-year-olds is unconstitutional, appeals court says

If you are 18, the United States Federal Freakin’ Government can come along and draft your ass and put a gun in your hands and drop you behind enemy lines… but there are those in the government who think that a 20-year-old should not be allowed to have a pistol of their own.

A 19-year-old, to these people, is not responsible enough to own a small firearm… but, sure, put a 16-year-old behind a two-ton chunk of metal capable of a hundred miles an hour.

If an 18-year-old is not old enough to handle their full Constitutional rights… why are they allowed to vote?

Anyway… the 4th US Circuit Court Of Appeals ruled two to one that the Constitution applies to 18-year-olds. Of the three judges, one was appointed by Trump, one by Dubya, and one by Obama. Guess which one thinks that the Constitution is just a set of vague guidelines, not rules restraining government power?