WOW I thought she was long gone.
Not my cup of tea. But she certainly is a survivor. Elvis should be back later this year to retake this record.
From her first hit ("Banana Boat Song", w/e 15th Feb 1957) to her latest ("The Living Tree", w/e 5th May 2007), Shirley Bassey's chart career has spanned 50 years, 2 months and 18 days [2620 weeks]. She, thus, became the first artist to have a career of hits spanning more than 50 years.
Most durable male artist is Elvis Presley on 49 years, 0 months and 2 days [2557 weeks] ("Heartbreak Hotel", w/e 12th May 1956 to the re-issue of "A Little Less Conversation", w/e 14th May 2005)
The record for longest span of hits by a group is by Perez 'Prez' Prado & His Orchestra (40 years, 3 months 12 days) [2103 weeks] (from "Cherry Pink And Apple Blossom White" in Mar 1955 to the departure of "Guaglione" in July 1995).