A handpicked selection of stories from BBC Future, Culture, Worklife, and Travel, delivered to your inbox every Friday. If you liked this story, sign up for the weekly bbc.com features newsletter, called “The Essential List”. Join one million Future fans by liking us on Facebook, or follow us on Twitter or Instagram. This article originally appeared on The Conversation, and is republished under a Creative Commons licence. (Image credit: Shutterstock) The majestic blue whale has plied the seas for about 4.5 million years. He is also the author of The Maths of Life and Death. Most mammal species exist for 1 million to 2 million years. It’s worth bearing in mind, when you find that Rex is reluctant to chase the ball like he once did, that he’s probably got more miles on the clock than you’ve been giving him credit for.Ĭhristian Yates is a senior lecturer in mathematical biology at the University of Bath. In practice the new molecular insights into human-to-dog age conversion encapsulated by the logarithmic law suggest that dogs move into middle age even more rapidly than most dog-owners would have suspected. The blue curve in the above figure, which represents this ad hoc rule, shows better agreement with the new logarithmic law. Most dog lovers will already have suspected that the human-to-dog age relationship is non-linear, having noticed that, initially, their pets mature much more quickly than the linear factor-of-seven rule suggests.Ī more sophisticated refinement to the factor-of-seven rules has suggested that each of the dog’s first two years correspond to 12 human years while all subsequent years count for four human equivalents. Under the “factor-of-seven” conversion rule, this would equate to an unfathomable 140 human-equivalent years. Social Security Sues 32 Year-Old For Benefits ‘He’ Received 21 Years Ago, At Age 11 Coming in second on the list: Spirit Airlines, which was a surprise, according to Gonzalez. And at the other end of the spectrum, although unusual, some dogs have been known to live for over 20 years. The age you feel means more than your birth dateįor example, most dog breeds reach sexual maturity between the ages of six and 12 months – the upper end of that range corresponding, by the traditional conversion, to a human age of seven.Why do we think cats are so unfriendly?.And if we look at some basic developmental milestones, it’s clear why. But new research suggests that things aren’t so simple. The underlying assumption is that each calendar year a dog lives through is equivalent to seven human years at any stage of a dog’s life. This conversion factor – each year of a dog’s life accounting for seven human years – comes from dividing human life expectancy of around 77 by the canine life expectancy of around 11. This means that a five-year-old feline would be approximately 36 in cat years. 48 months) was the most important factor affecting eating quality. If your dog has been alive and kicking its paws about for a decade, the widely held belief is it has aged as much as a human would have done over 70 years. Each year after, it ages approximately four cat years for every calendar year. In an experiment mainly directed at processing factors, Thompson et al.
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