Adult slowworms grow to be about 50 cm long, and are known for their exceptionally long lives; the slowworm may be the longest-living lizard, living about 30 years in the wild and up to at least 54 years in captivity (this record is held by a male slowworm that lived at the Copenhagen Zoo from 1892 until 1946, the age when first obtained is unknown).[4][5] The female often has a stripe along the spine and dark sides, while the male may have blue spots dorsally. Juveniles of both sexes are gold with dark brown bellies and sides with a dark stripe along the spine.