The organisation says those at risk range from a 1920s chemical silo in Billingham and lime kilns at South Shields, to a greenhouse with a pottingshed in County Durham and Britain's first ever bird research station in Northumberland.
Run by full-time chairman Richard Tims, 43, the oldest football team in the world has gone from its humble beginnings in a Sheffield pottingshed to a club of three senior teams, 13 junior teams, a women's team and one disability team.
Their productivity may decline as they get older although people gain in experience, their capacity for sharp thinking falls off but the traditional pattern of retirement, in which one day an employee is in a bustling office busy as a bee and the next he is good only for the pottingshed and the fireside chair does not make sense for the economy, for companies or for people.