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Lung size is proportional to body size. Respiratory tests for diseases like Asthma use this fact to determine what your lung capacity "should" be to determine how impaired it is by measuring exhaled breath volumes. Generally the volume is proportional to the cube of the height of the patient compared to observed lung volumes in autopsies. This comparison is age dependent as you get to be about 20, you stopped growing lung tissue and your lung capacity stabilized. This lasts for about 10 years. At about 30 your lungs are on a decline. and you lose 20 percent of your vital lung capacity by about age 35. By 50, you've lost 40 percent of your breathing capacity and the decline continues for life.

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13y ago

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