a young individual with little or no experience

青二才, 若造
a young energetic person that brings new ideas, enthusiasm, and vitality to a group, organization, or activity

新風, 若い力
used when someone has learned or experienced something from a very young age

幼い頃から, 物心つく頃から
(of a person) very young or very small

とても小さい, ちっちゃい
the time in a person's life marked by youthfulness, inexperience, and being carefree

青春時代, 青二才の頃
used to refer to people who look older than the age they are at

年より老け, 向こう側
an advanced stage of life characterized by a long lifespan and great wisdom

高齢, 円熟した老齢
used to describe someone or something that is old and has existed for a long time

とても古い, 古代の
describing an individual who has lived for a very long time and is not able to do certain activities due to old age

年をとりすぎている, 老けた
used to describe an old person who is still very active and healthy

壮健で元気な, 壮健な
a senior citizen that spends a lot of time using the Internet

シルバーサーファー, 高齢インターネットユーザー
used to refer to a significant age difference between two people, especially those who are romantically involved with one another

親になれる年上, 親子ほどの年齢差
considered old and no longer at one's best

盛りを過ぎた, 終わった
