Originally Posted by wally626
Purchase of handguns is an age of license issue not an age of majority.
Nope. At issue are the Federal Statutes that prohibit a anyone with a Federal Firearms License (FFL) from selling handguns to any person under the age of 21. Also at issue, is the general prohibition of any merchant selling ammunition which is generally used in handguns, to any person under the age of 21.
This is not a licensing issue at all. It is a federal requirement for FFL's and those who sell ammunition. That is what is being challenged in the first case.
The second case is specifically challenging the Texas Concealed Carry laws, in as much as they deny the Fundamental Right of Self-Defense to adult citizens.
A drivers license is irrelevant, as the majority will quickly say that this is a privilege and not a right (I don't agree, but I'm in the minority). The same goes for drinking. That also is not an enumerated right.
The other things you mentioned (marriage, service, contracts) are rights and you will notice that they are all available once you reach 18. Hunting is special, in that both the State and Federal Governments have a compelling interest in keeping the game (and habitat) available to all. The laws governing this are narrowly constructed and are the least restrictive means to achieve that goal.