A veteran of many years in the Night’s Watch, Gared is a canny old man of about fifty years, known for the skill with which he can wield the short, ugly sword he keeps wickedly-sharp.
In the novel, more detail is given about Gared, and the fact that he’s lost ears, toes, and fingers to frostbite are a part of his argument for why they should turn back. All indications suggest these details may be dropped for the show. Furthermore, the character survives to be executed by Lord Eddard, whereas in the show he is killed immediately by the Others.
Ranging beyond the Wall with Ser Waymar Royce and Will, Gared is killed by the White Walkers.