Jonathan Ross is set to host the BBC One tribute to the much-loved sitcom this summer, featuring many of its stars.
But only five of the core cast are still alive. They include Clive Dunn, 88, Ian Lavender, 62, and Bill Pertwee, 81.
Frank Williams, who played Rev Timothy Farthing, is also still alive at 76, as is 82-year-old Colin Bean, who played the minor, but regular, platoon member Private Sponge.
Writers Jimmy Perry and David Croft as well as other staff who worked on the show are also expected to appear on the birthday tribute.
Several Dad’s Army episodes will also be repeated on BBC Two to mark the anniversary. A total of 80 shows were made, airing over nine series from July 31, 1968, to November 1977.
