The ageing of the population is one of the most significant phenomena of the 21st century. The Aging population is a problem that affects all regions and all countries with different levels of development. Its progression is faster in the developing countries, even among those with a high number of Young people. The decrease in fertility, the increase in life expectancy for all age groups and the reduction in mortality rates are among the factors that, more than others, push our population towards a gradual aging of the population. Furthermore, there may be an increase in population even if the birth rate and fertility rate decrease, because there is a great rate of people born at different ages who are fruitful. Well-being leads to an increase in average life, but the fertility rate decreases especially in developed countries.The National Statistics In 2016 stated that the population of the UK was 65.6 million. From the statistics is clear that the population in the UK is getting older with 18% aged 65 and over and 2.4% aged 85 and over. In 2016 there were 285 people aged 65 and over for every 1,000 people aged 16 to 64 years which is the traditional working age. (Malissa Randal, 21 July 2017)These statistics show that there are less young people than few years ago, because less children were born in the last few years. This is due to the fact that the idea of family has changed over time, now people tend to get married less often as they prefer to live together or they just get married in a older age. Birth rate decreased also due to the fact that same sex couple increased from the past and they are accepted and also became legally recognised in many countries. Instead the elderly are increasing, because people today live longer for many reasons: such as healthier lifesty, better nutrition, hygiene, progress in the field of medicine,development of new technology live in better house and have a better healthcare to treat themselves than many years ago.Today, women live on average 82.2 years and men 79.1 according to Office of the National Statistics. From the graph 1.1 and 1.2 is evident that the life expentacy of male and female has increased.Many women with families also work outside the home and men help their children grow up: it is therefore said that roles in the family have changed and are less rigid than many years ago, and that the women can do things that only men did before and vice versa. The demographic ageing has inevitable repercussions on the labour market, public spending, social services and therefore on the economic trend and the social, health and cultural evolution of our country. The number and the percentage of seniors that is increasing faster than any other age group, raise concerns about the ability of companies to cope with the challenges associated with this demographic change. Ageing is a triumph of development. A ever-increasing longevity is one of humanity’s great achievements. You live longer thanks to better nutrition, hygiene, progress in the field of medicine, medical care, education and economic well-being. Life expectancy at birth is currently over 80 years in 33 countries; five years ago, the countries that had achieved this goal were only 19. Currently, only Japan has a population elderly more than 30% of the total; it is believed that by 2050, 64 countries they will reach Japan on these percentages.