"Have you ever heard anything about God, Topsy? ... Do you know who made you?" "Nobody, as I knows on," said the child. ... "I spect I grow'd. Don't think nobody never made me." [Harriet B. Stowe, "Uncle Tom's Cabin," 1851]Grown-up (adj.) "mature" is from 1633; the noun meaning "adult person" is from 1813. Growth is first attested 1557, on model of health, stealth, etc.
v. grew (grōō), grown (grōn), grow·ing, grows
To increase in size by a natural process.
To develop and reach maturity.
To be capable of growth; thrive.