"having lived long," mid-15c., past participle adjective from age (v.). Meaning "having been allowed to get old" (of cheese, etc.) is by 1873. Meaning "of the age of" is from 1630s. Aged Parent is from "Great Expectations" (1860-61).
1. Each year, one in 100 girls aged 15-19 takes an overdose.
2. The Georgian, aged 19, is not one of the game's big hitters.
3. The bulk of the book concerns Sandy's two middle-aged children.
4. She has an aged parent who's capable of being very difficult.
5. One boy, aged about 11, looks frozen with fright.