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www.reference.com/article/old-age-389f7d74c1683eee

"Old age" is a subjective expression referring to a person in the later stages of life. People debate the specific age at which someone is "old," but "old age" often refers to someone who is retired and who likely requires higher amounts of routine health care.

www.reference.com/article/people-age-dc1471ebd25bb78e

There are two theories as to why people age. One theory posits that aging is naturally programmed into the body. The second theory is that aging is the result of damage that has accumulated during life, which is why some people live longer than others.

www.reference.com/history/impact-information-age-48af033aa1599353

The Information Age moved society from an industry-based economy to an information-based economy. It has generated research, work, commerce and new forms of entertainment and has given most of the world access to information. The Internet and its subsequent developments are prime examples of technol

www.reference.com/article/signs-dog-aging-b24553e54fca1a11

Ways in which dogs age are by slowing down, becoming gray in the face or muzzle and developing some muscle atrophy. Some dogs experience hearing loss and eyes that are cloudy or bluish. Larger-breed dogs age more quickly than their smaller counterparts.

www.reference.com/article/age-common-man-6645fe1a1d6dc5ef

The Age of the Common Man occurred during the presidency of Andrew Jackson starting in 1828 and lasted throughout the following decade. The age is characterized by the ability of ordinary white men to be elected into government office and by the fact that almost all white men could vote.

www.reference.com/article/age-considered-old-b6dbb2d114b69a48

Old age has historically been measured by chronological age. However, this metric does not take into account improvements in life expectancy and health, says Futurity. In 1800, a European male had only a 25 percent chance of reaching the age of 60, whereas 90 percent of contemporary European men do.

www.reference.com/article/fun-age-test-dea4f7cf12c54d13

Playbuzz has a sample fun age test that offers multiple choice questions to a variety of questions with graphics and pictures. AllTheTests.com and Age-Test.com also have age tests with multiple choice questions based on one's personality and preferences to determine one's mental age.

www.reference.com/article/age-earth-6247037bb9faa010

The Earth is 4.55 billion years old, plus or minus 50 million years, as of 2014. The determination of the Earth's age is based on radiometric dating techniques involving the rate of decay of naturally occurring radioactive isotopes.

www.reference.com/article/happens-stars-age-363d53973c1f0449

Stars on the main sequence that are the same size as the Sun begin as yellow stars and turn into red giants as their hydrogen fuel runs out. Other stars shrink or explode, depending on their size.

www.reference.com/article/cats-age-f086bd069f4c8c0e

Cats age comparatively slower than dogs but still at much faster rates than humans. For instance, the first year of a cat's life is usually considered to be the equivalent of 15 to 18 years in a human, while a 2-year-old cat is about 24 in human years.