いい年をして[iitoshiwoshite] (in spite of) being old enough to know better
亥年[idoshi] year of the boar
一箇年[ikkanen] one year
一周年[isshuunen] one full year
一年以内に[ichineninaini] within a year

一年間[ichinenkan] (period of) one year
一年生[ichinensei] annual (plant)
一年草[ichinensou] annual (plant)
一年ぢゅう[ichinenjuu] all year round
一両年[ichiryounen] (a) year or two

軽輩[keihai] underling
後輩[kouhai] junior (at work, school, etc.)
若輩者[jakuhaisha] fledgling
先輩[senpai] senior (at work or school)
鼠輩[sohai] small fry

俗輩[zokuhai] worldlings
同年輩[dounenpai] persons of the same age
同年輩の人[dounenpainohito] contemporary
同輩[douhai] fellows
年輩[nenpai] elderly