Bearded Collies have an average weight of 18–27 kilograms (40–60 lb). Males are around 51–56 centimetres (20–22 in) tall at the withers while females are around 51–53 centimetres (20–21 in) tall. The median longevity (the age at which half of the population has died and half is still alive) of Bearded Collies from recent UK and USA/Canada surveys (the weighted average of all surveys) is 12.8 years; Beardies  in the UK surveys lived longer (median ~13.4 years) than their USA/Canada counterparts (median 12.0 years). In a 1996 USA/Canada survey, 32% of Beardies died (including accidental deaths) before the age of nine; however, 12% lived longer than 14 years. The eldest of the 278 deceased dogs in the 2004 UK Kennel Club survey died at 19.5 years; the age at death of the oldest dog in the USA/Canada survey was not reported. The size of an average litter is seven pups.