Ageing population. Whats changes does it bring to today's society? In our society, people live longer and longer but this may be a problem in the immediate future. Ageing of the population would bring problems on the NHS system financing, and increase its costs due to it larger use. Caring elder people will be an important field in which our countries will spend a lot of money. Whereas, if the number of births decreases, in the future workers will not be enough for supporting the system. Because of these facts, we might design a policy that makes sustainable the future of paying our elder people pensions. One of these alternatives would be an "active retire", a hybrid way in which our senior population continue working for a few hours per day, earning money and paying a reduced amount to the NHS system. On the other hand, if we consider keeping our senior population retired, we would have other alternatives such as special taxes that allowing the State to take money enough for making a stable system for future generations. In conclusion, our society will deal with problems in the short time that would be faced in many different ways, but they still are challenging for us.