Half-Orcs are people with mixed Orcish-Human ancestry. Anyone with more than 1/4 Orcish ancestry will be a Half-Orc. Despite the name, they do not need to be actually half Orcish. Half-Orcs vary from being almost indistinguishable from Orcs to almost indistinguishable from Humans. Most resemble what the name suggests. They are tall and muscular, far more than the average Human, but not as much as the average Orc. They have tusks, but their tusks are not as long as the tusks on proper Orcs.
Half-Orcs tend to come of age at about 18 and usually live to be 100 to 120.