Over 700,000 of people aged 65 or over in the UK say they are always or often lonely, Age UK have said.
There are now more people in the UK aged 60 and above than there are under 18.
17% of older people have less than weekly contact with family, friends or neighbours.
36% of people aged 65 and over in the UK feel out of touch with the pace of modern life and 9% say they feel cut off from society/
About 3.8 million older people live alone. 1.5 million are women.
More top news
Theresa May has launched her bid to become the next leader of the Conservative Party.
David Cameron's successor is likely to make the decision on whether to expand Heathrow or another London airport.
Michael Gove is to stand for the Conservative Party leadership, saying he does not believe Boris Johnson can "provide the leadership".