Englishfor English speakers
grown
—
adjective
(= adult)
(of animals) fully developed
an adult animal
a grown woman
old
Adjective
—
If someone or something is old, they are not young; they have been in existence for a long time.
An old man has gray hair.
—
How old someone is, is their age.
"Ashley, how old are you?" "I'm only 16 years old."