Dictionary

People who are young; young people, collectively; youth.

Example: The young of today are well-educated.

Young or immature offspring (especially of an animal).

Example: The lion caught a gnu to feed its young.

(possibly nonstandard) An individual offspring; a single recently born or hatched organism.

To become or seem to become younger.

To cause to appear younger.

To exhibit younging.

In the early part of growth or life; born not long ago.

Example: a lamb is a young sheep;  these picture books are for young readers

At an early stage of existence or development; having recently come into existence.

Example: the age of space travel is still young;   a young business

(Not) advanced in age; (far towards or) at a specified stage of existence or age.

Example: How young is your dog?   Her grandmother turned 70 years young last month.

Junior (of two related people with the same name).