The invention provides an age estimating method and an age estimating device. The age estimating method comprises the steps of: acquiring a target face image; extracting face image characteristics corresponding to the target face image based on a preset face recognition algorithm; comparing the face image characteristics with face image characteristics which are stored in a preset database to obtain a similarity; and if the similarity is greater than or equal to a preset threshold value, determining an estimated age of the target face image according to the age information corresponding to the stored face image characteristics of the obtained similarity. According to the age estimating method and the age estimating device, the age estimating accuracy can be improved.