We usually require and keep on-file one model release for each of your models only, regardless of the number of shooting sessions uploaded. Even if you have more MR documents offline, you need to upload one per model. You do need to add new model releases once your models move to different age groups. Our advanced search engine includes an age parameter so if your model moves for instance from the 21-30 yrs old category to the 31-45 yrs old category, a new model release for the same person must be added and used accordingly. This way, the age relevancy is kept in searches and your images get accurate exposure.