In Cryptography, plain text is the term referring to the readable message (sometimes clear text), as opposed to cypher text, the encoded message, whose content is hidden from casual observers.
... age of 18, 7.4% from 18 to 24, 32.6% from 25 to 44, 23.2% from 45 to 64, and 12.2% who are 65 years of age or older. The median age is 37 years. For every 100 females ...