Ageing is a natural and biological process. It is inevitable for each and every individual. It is the consequence of declining fertility and mortality. India is the second largest country in the world after China having 77 million elderly populations, which constitute around 7.6 percent of the total population in 2001 census. This paper focused on the trend of demographic change and its consequence since 1950-2050 in India. Specially it gives importance on the total fertility rate, growth rate of total and older population, life expectancy rate at birth and at age 60, median age, ageing index, potential support ratio, parent support ratio, dependency ratio etc for measuring the trends and growth of elderly persons in India. The paper uses the available latest secondary data from the United Nations publications and the census of India. It critically analyse the trends of ageing and its future implication. We found that almost all the indicators such as reduction of fertility, increasing life expectancy, ratio of youth and elderly persons, median age, potential support ratio, parent support ratio etc. are increasing over the period 1950-2050. It shows that these indicators are tending towards the ageing population in the first quarter of the twenty first century. The general belief is that the elderly persons need support, health care in their day today activities because they are unable to manage themselves. In India there is not sufficient attention given for the well being of the elderly, so in this stage it needs to think for the welfare and rights of the elderly persons. The paper concludes with the suitable policy and suggestions for the welfare of the large elderly masses. In this stage the researcher, government, non-government organization, policy makers should think about the suitable measures for the well being of the elderly persons.