Dear Sally, There is a little bit about the age of a red deer from the Late Mesolithic site of Ertebolle and a roe from Ringkloster which may be prenatal in my PhD thesis. This is now in the UCL and Univ. of London library, Senate House: 'Human Subsistence and Seasonality in Mesolithic Northwest Europe Based on Studies of Mandibular Bone and Dentition in Red Deer (Cervus elaphus) and Roe Deer (Capreolus capreolus)'. I will check my refs. and see if there are any modern studies which may help you. Best wishes, Richard Carter