Volunteering England has warned that the Government's decision to delay the official retirement age could rob the sector of a huge army of volunteers.
In an online survey for the charity conducted last week, 70 per cent of the 2,288 people who took part said they would now be less likely to volunteer.
Christopher Spence, chief executive of Volunteering England, said: "It's a real concern that people believe they won't be able to volunteer when they retire because they have to work longer.
"Retired people who volunteer provide essential support to many public and community services.
"If the perception is borne out by reality, the voluntary movement will need to do more to make volunteering opportunities more flexible to meet the needs of busy working people."