People are living longer and enjoying longer fuller, healthier lives - this is a massive benefit.
Older people could be given the choice to work longer. They could then use the benefit of their experience and knowledge to fully benefit society. For far too long older people have been undervalued in modern society.
Younger retired people contribute lots to the economy. They have reasonable amounts of money and lots of leisure time hence are good consumers. We have already seen the rise of the "silver surfer", older people who surf the internet!
Many retired people do voluntary work in schools and for charities that is essential work but done for FREE.
Many retired grandparents are now fulfilling child care roles for their grandchildren as the cost of child care rises. This vital role unifies the extended family and allows parents to work and contribute to the economy.