Shirley Bassey breaks Elvis' longevity record on the U.K. Singles chart. From her first hit, "Banana Boat Song" (w/e 15th Feb 1957) to her latest chart entry with "The Living Tree" (w/e 5th May 2007), her Bassey's chart career has spanned 50 years, 2 months and 18 days (2620 weeks). She is 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) from his first hit "Heartbreak Hotel" (w/e 12th May 1956) to the 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 And His Orchestra with 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.
Elvis still has the longevity for records that went to number one (his first #1 n 1957, the last #1 in 2005).