Altitude is an attribute of a body, describing its elevation from a known level defined as zero level. Most often this level is defined as the absolute sea level, but it can vary.
Altitude is a one dimensional quantity, measured in the same units as length, most preferably in meters, although the foot[?] is commonly used in aviation.
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... under the age of 18, 6.7% from 18 to 24, 28.0% from 25 to 44, 25.8% from 45 to 64, and 17.2% who are 65 years of age or older. The median age is 41 years. For every 100 ...