What does "all ages" mean?

open to people of all ages, particularly to children under the age of 18 (of an entertainment event, particularly music or dance)

All ages

adj

adj ·Rare ·Advanced level

Adjective

1
open to people of all ages, particularly to children under the age of 18 (of an entertainment event, particularly music or dance) US, not-comparable
"There are some all ages contests at the fair."

"There are some all ages contests at the fair."

Ellipsis of for people of all ages