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

御手盛り[otemori] making arbitrary decisions which benefit oneself
いたずら盛り[itazurazakari] mischievous age
人生の真っ盛り[isshounomassakari] the noontide of life
一盛り[hitosakari] temporary prosperity
一盛り[hitomori] pile

栄枯盛衰[eikoseisui] ups and downs of life
旺盛[ousei] full of vim and vigor
花盛り[hanazakari] flowers in full bloom
勤め盛り[tsutomezakari] the prime of one's career
最盛期[saiseiki] golden age