Japanese edit

For pronunciation and definitions of せいねん – see the following entries.
青年
[noun] a young man; a youth
成年
[noun] legal age, age (time of life when one attains full person rights), the age of adulthood (20 in Japan)
生年
[noun] year of birth
[noun] number of years since one was born; age
盛年
[noun] prime of age
(This term, せいねん, is the hiragana spelling of the above terms.)