YOUNGER

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).

(of a decade of life) early.

Youthful; having the look or qualities of a young person.

Example: "My grandmother is a very active woman and is quite young for her age."

Of or belonging to the early part of life.

Example: "The cynical world soon shattered my young dreams."

Having little experience; inexperienced; unpracticed; ignorant; weak.