An Asian elephant has an average life span of about 40 years. In 1998, the average life span of a US resident was about 77. The average life span of an opossum is 1 year.

One familiar conversion formula describes the relationship between degrees Celsius and degrees Fahrenheit: F = 1.8C + 32.

For an age older than 1, the graph of equivalent human age versus a large dog’s age in years lies along a straight line.

According to The Guinness Book of Records, the world’s oldest dog was an Australian cattle-dog named Bluey. He died at the age of 29 years and 5 months in 1939.

The world’s oldest cat, a sphinx, was Granpa Rexs Allen, adopted from the Humane Society of Travis County (Texas), who died in 1998 at the age of 34 years, 2 months.