Nearly 900 people have registered an interest in becoming a trustee in the first three weeks of the Get On Board campaign.
The campaign, which is run by the Charity Commission and TimeBank, aims to boost the number of trustees and recruit people with more diverse backgrounds.
Some 76 per cent of new registrants are under the age of 45, compared with only 24 per cent of trustees overall. In total, 10 per cent of the new registrations are under 25, compared with 0.5 per cent of trustees generally.
Another 22 per cent of new registrations are from black and minority ethnic backgrounds, compared with less than 5 per cent of trustees generally.
The campaign has also attracted more women, who comprise 57 per cent of new registrations compared with 45 per cent of trustees overall.
"Charities should be recruiting trustees who reflect the communities they serve," said Moira Swinbank, chief executive of TimeBank.
"We want to dispel the myths about being a trustee. You don't need to be asked, or a powerful mover or shaker."