In Economics, the Consumer Price Index (CPI) is a statistical measure of a weighted average of prices of a specified set of goods and services purchased by wage earners in urban areas.
The CPI is a fixed quantity price index and cannot reflect the improvement/deprovement of quality. The CPI also ignores the introduction of new products.
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... the population is spread out with 25.6% under the age of 18, 7.5% from 18 to 24, 33.8% from 25 to 44, 21.3% from 45 to 64, and 11.8% who are 65 years of age or older. ...