For the purpose of teaching I need to know the contemporary point of view on epidermal turnover time. The data of scientific and educational literature are very different. Average time varies from 28 days through 39 days to 47 days. It is not very clear how this depends on the localization of the skin area, on sex and age. The most famous work (Iizuka, H., 1994) is quite old and rather general. Maybe there is a good review of the literature on this or educational material?