Why Do Pets Age Faster Than Humans?

PetFeatureWhile there are animals that live longer than us, such as the giant tortoise (152 years) and the buzzard (118 years), generally have a longer life expectancy than that of most animals, and apparently age more slower than them. It is painful for pet owners when they can only spend a small percentage of your life with your beloved pets. Unfortunately there is still no concrete scientific explanation of its short life expectancy, but there are some theories about why the animals age faster than humans.

Size

The general expectation has been that larger animals have longer life expectations. However, scientists have discovered many errors in this theory. When you consider that a squirrel live 14 years, while a rat lives only 3 you can see why there must be more to influence the life of an animal than just its size. The most obvious example is that humans live an average of 70 to 75 years, however we are smaller than a grizzly bear, who lives 32. This led to the theory that brain size is a factor in the theory of body size.Therefore, a factor that causes more other live animals is to have a brain-body greater than most other animals.

Metabolism

Another factor in life expectancy and the aging rate is the metabolism of an animal. Small animals generally have a faster metabolism. Considering that an animal (including humans) only has a billion heartbeats before he died, while those beats faster the animal soon dies are used. This causes the smaller animals, which have higher metabolisms, wear out or reach the end of its lifetime a lot faster than larger animals speed. Being a large animal with a slower metabolism, human beings have the privilege of having a longer life expectancy, and a slower rate of aging.

Reproduction

Another factor that figures prominently in the field of aging animals is the age of sexual maturity and the number of offspring that an animal can generate. The animals reach sexual maturity quickly and have larger litters have a shorter life expectancy. Humans took long time to reach sexual maturity compared with other animals and usually only have one baby at a time. Therefore we need a longer life expectancy and a rate slower to replace our aging population. However, a mouse reaches sexual maturity to take a few weeks from birth and is capable of having six or more litters of pups has a shorter life expectancy.

Theories / Speculation

In addition to size, metabolism, and sexual maturity, there are other reasons that we live more than other animals. According to sexual maturity as a determinant of life expectancy, it is theorized that prey animals reach sexual maturity sooner because they have a more dangerous life and need to be played as soon as possible to repopulate their species. Humans have no natural predators, have the luxury of reaching sexual maturity at a slower and have a longer life rate.

Exceptions

Aging and differences in life expectancy are still a mystery to the scientific world. There are many guides to understand why we age the rate at which we do as the animals age faster and have shorter lives, but there are many exceptions to the rules. The birds, porcupines and bats live longer than animals of similar size and in similar circumstances. The naked mole rat, which has the same size of a mouse (who lives 3 years) living awesomely 28. Gerontologists (those who study aging) continue to investigate, hoping to discover a fountain of youth, or at least solve the mystery of why we age at this speed.

Source: eHow, Em Connell Mccarty

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