It is rated 16+, however I do not believe that this age rating is to stop you from buying the game, just to warn that it may be offensive to some.
M for Mature
The PEGI rating for Halo 4 is 16
Halo: Reach has a PEGI rating of 16.
PEGI 16
T is for Teen
Pegi-rating is an easy-to-read graphical system used to rate video games for age appropriate content across Europe.
PEGI 16+.
PEGI 18+.
PEGI rated it 12+
ESRB and PEGI
No The PEGI (Pan European Games Information) ratings are 3, 7, 12, 16 and 18
TV ma
The ESRB rating is Mature. The PEGI rating is 18. The BBFC rating is 15.
ESRB rated it: T(teen) PEGI's rating was: 16