Today's newborns are going to have to work until they’re 77. But how will they cope with working so long, and should they have to? To find out, former Apprentice colleagues Nick Hewer and Margaret Mountford launch a bold experiment, sending 15 retirees in their 70s back to full-time work. The pair uncover some startling truths when the pensioners head back to work for, respectively, a construction site, a chocolate factory, an Italian restaurant, a health clinic and an estate agent.