young

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

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.

the age of space travel is still young

a young business

advanced in age; (far towards or) at a specified stage of existence or age.

And thou, our Mother, twice two centuries young, Bend with bright shafts of truth thy bow fresh-strung.

How young is your dog?

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

The young Mr. Chester must be in the wrong, and the old Mr. Chester must be in the right.

Early. (of a decade of life)

1922, E. Barrington, “The Mystery of Stella” in “The Ladies!” A Shining Constellation of Wit and Beauty, Boston: Atlantic Monthly Press, pp. 40-41, […] Miss Hessy is as pretty a girl as eye can see, in her young twenties and a bit of a fortune to boot.

Ephraim would be in his young thirties.

Offspring, especially the immature offspring of animals.

The lion caught a gnu to feed its young.

The lion's young are curious about the world around them.

To become or seem to become younger.

The aging (or younging) of a population refers to the fact that a population, as a unit of observation, is getting older (or younger).

To cause to appear younger.

Medicare data was "younged" by a month to achieve conformity with the conventional completed ages recorded in the census.

To exhibit younging.

Shoshonitic magmatism younged southwards in the Superior Province, commensurate with the southwardly diachronous accretion of allochthonous subprovinces.

The existence of magmatic belts younging northward implies that slabs of Asian mantle subducted one after another under ranges north of the Himalayas.