United States (ESRB): M for blood, gore and intense violence
United Kingdom (BBFC): 15 for strong violence and moderate horror
Europe (PEGI): 16+ for realistic looking violence
Australia (OFLC): MA15+ for strong violence
New Zealand (OFLC): R16+ could not find reason (probably because of violence)
Hope this helps! :)
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If you mean age rating, it is rated M for mature by ESRB for Blood, Violence, and Drug Content (Which in many M games, such as this one, none our found).
Half-Life, Half-Life: Blueshift, Half-life: Opposing Force, Half-life: High Definition pack (might not classify as a game), Half-Life: Source, Half-Life 2, Half-Life 2: Episode 1, and Half-Life 2: Episode 2. Eight games total not including countless mods created by fans that you can download for free on moddb.com and fileplanet.com. Other games by Valve software include Left 4 Dead, Left 4 Dead 2, Portal, Portal 2, Counter Strike, Counter Strike: Source, Team Fortress, Team Fortress 2, and Alien Swarm. Another Half-Life game would be Half-Life: Decay. You might also be able to count Half-Life Deathmatch and Half-Life 2 Deathmatch.
Mature+ Blood and gore 17 or older.
Only for the half life 2 version of garry's mod.
Gordon Freeman
No it is not. It requires one of the games in the half life 2 series such as TF2 portal or half life 2.