Help the Aged and Age Concern England have entered an extensive consultation process with their partners with a view to merging and creating a new organisation.
A final decision will be made in September and decisions about a name, organisational priorities and other issues connected to the creation of a new charity will be made over the next few months.
Both charities are seeking support and positive feedback from partners, friends and allies. Those affected include 353 Age Concerns in England, Help Age International and the independent Age Concern organisations in Scotland, Wales and Northern Ireland.
Age Concern England chair Catherine McLoughlin said: "Spending time and energy operating separately no longer makes sense. Instead we intend to pool our talents and resources to ensure older people's needs receive the even greater focus they deserve."
Jo Connell, chair of Help the aged said there had never been "a greater need or a more compelling reason for such an organisation."
"The demands of an ageing society mean that this in-principle decision – which has been taken collaboratively and in partnership – is the right one for older people today and tomorrow. There is an urgent need to protect the human rights of older people as well as ensuring that our ageing society recognises the enormous contribution they make."