A yearling is a deer that is between one and two years old. Therefore during most deer seasons they are 1 1/2 years old. I know fawns are mistakenly called yearlings but they are not. Yearling bucks can be a spike, four ,six , eight point or whatever. Don' t mean to be a smart a-- but that' s what they are. If I wanted to shoot a doe and she had a fawn with her during hunting season it wouldn' t make any difference one way or the other.