This book analyzes the problem of population ageing in terms of the cessation of professional activity (and especially premature labour market withdrawals) and non-medical care needs of persons who are dependent or have lost their autonomy, in order to provide the various public and private administrations active in these fields with some food for thought. One of my concerns is to examine the factors liable to explain early exits from the labour market by positing that labour demand may have an impact on decisions to stop work early. The chapter on Overeducation is devoted to testing a series of theoretical results encountered in the economic literature including the trade-off between education and experience in the labour market. I also present the long-term care insurance in Belgium and project the level of dependency in 2050. Based on the regional projections obtained, I estimate the budgetary cost of introducing dependency insurance in Wallonia identical to that of Flanders (beginning at the same time as the latter and undergoing the same changes).