Abstract
The objective of the present paper is twofold: (1) to make an attempt to review in general the inter-linkages between the demographic transition model and the ageing process, (2) to show how one can make use of the recent criterion suggested by McCracken and Phillips in understanding the ageing process presently taking place in different countries of the world. The study comes to the important conclusion that out of 210 countries in the world, in 91 countries the aging process is in full progress. In 63 countries it is going to be a problem in the near future. However, for 56 countries it is not at all a problem and majority of these countries are observed in the African region, if one follows the criterion suggested by McCracken and Phillips. [130 words]