The skeletons of animals develop during the process of ageing. The time of fusion of different skeletal parts helps estimate the time of slaughter of the animals. The data of epiphyseal fusion of recent animals are used to establish models of age criteria of the different seasons of the year. The models constructed have been tested against the age indications registered at different prehistoric sites. The test was used in the latent profile analysis. The aim was to interpret seasonal occupation of the hunters at different sites in Norrland, Sweden. See also AATA 20-32. -- AATA