Synonyms of the word

oldster

• n. Someone who is old.

adult

• n. A fully grown human or animal.
• n. A person who has reached the legal age of majority, generally 18 years of age.
• adj. Fully grown.
• adj. Intended for or restricted to adults rather than children.
• adj. Containing material of an explicit sexual nature; designating pornography.
• v. (nonstandard, rare) To (cause to) be or become an adult.

grownup

• adj. Of, pertaining to, or suitable for adults.
• adj. Adult; fully developed; mature.
• n. An adult. (used especially by children).