young

1 young /ˈjʌŋ/ adjective
younger /ˈjʌŋgɚ/ ; young /-gəst/ /ˈjʌŋgəst/
1 young
/ˈjʌŋ/
adjective
younger /ˈjʌŋgɚ/ ; young /-gəst/ /ˈjʌŋgəst/
Britannica Dictionary definition of YOUNG
1 
: in an early stage of life, growth, or development : not yet old
2 
: recently formed, produced, started, etc.

not getting any younger

informal + humorous
— used to say that someone is getting older and may not have much more time to do something

the younger

1 
— used in comparing the ages of two people who are members of the same family
2 
— used to refer to the younger of two people (such as a father and son) who have the same name

years young

informal
— used to describe an older person's age in a way that is meant to suggest that the person still looks or feels young

you're only young once

— used to say that people should enjoy themselves while they are young
2 young /ˈjʌŋ/ noun
2 young
/ˈjʌŋ/
noun
Britannica Dictionary definition of YOUNG
1 
the young : young people
2 
[plural] : young animals, birds, etc.

young and old

: young and old people