Centre for Ageing Better - an independent charitable foundation funded by an endowment from the National Lottery Community Fund. Part of the network of 'What Works' organisations that promote the better use of evidence. Links to a wide range of resources.
Age UK - "The country's largest charity dedicated to helping everyone make the most of later life. We provide companionship, advice and support for older people who need it most." Links to a wide range of resources.
Independent Age - a charity founded over 150 years ago. Offers "regular friendly contact... a strong campaigning voice… and impartial advice"
Age Action Alliance - brings together "older people and cross sector organisations to work together to celebrate the opportunities and address the challenges of our ageing demographics"