Answer:
The average height of a person depends on several factors, like gender, nationality, age, etc.
The average height for an american woman is currently 5 feet 4 inches. While the average height for an american man is currently 5 feet 9 inches.
In Peru, for example the average height for a man is 5 feet 4 1⁄2 inches while for men is 4 feet 11 1⁄2 inches.
In Noway, for man 5 ft 10 1⁄2 in and for woman 5 ft 6 in.
You can look for a List of average human height worldwide, in case you are looking for a nationality in particular.