Federal Law and Age Restrictions

Larry Elder interviews Law Professor (UCLA) Eugene Volokh about the proposed age limits to purchasing long-guns. In fact, in a recent article by Larry, he notes the law regarding the age one is in the militia:
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......The second point, often ignored, is the very purpose of the Second Amendment. It is to prevent government tyranny through the power of a citizens' militia. Since many on the left denounce President Donald Trump as a "tyrant" or a "dictator" or a "Hitler," they might find that the Second Amendment could come in handy. As to why a 19-year-old can legally get a gun, the Second Amendment refers to a "well-regulated militia" as necessary for our freedom.

And yes, a 19-year-old is part of the militia.

Section 311 of the U.S. Code Title 10 (as last amended in 1958) says: "(a) The militia of the United States consists of all able-bodied males at least 17 years of age and ... under 45 years of age who are, or who have made a declaration of intention to become, citizens of the United States and of female citizens of the United States who are members of the National Guard."...... (https://tinyurl.com/yaoq6cho)