に就て[nitsuite] concerning
に就き[nitsuki] because of
去就[kyoshuu] committing one's self
就いては[tsuiteha] in line with this
就きましては[tsukimashiteha] in line with this

就く[tsuku] to ascend (the throne)
就ける[tsukeru] to install (a king, emperor, etc.)
就学[shuugaku] entering school
就学義務[shuugakugimu] compulsory school attendance
就学児童[shuugakujidou] school child

何歳[nansai] how old?
凶歳[kyousai] poor crop year
歳未満[saimiman] under ... years of age
歳月[saigetsu] time
歳出[saishutsu] annual expenditure

歳入[sainyuu] annual revenue
歳入歳出[sainyuusaishutsu] annual income and expenditure
歳費[saihi] annual expenditure
歳暮[seibo] end of the year