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

お歯黒[ohaguro] tooth blackening
臼歯[kyuushi] molar
永久歯[eikyuushi] permanent tooth
奥歯[okuba] molars
下歯[shitaba] lower teeth

仮歯[kashi] false tooth
加工歯[kakoushi] dental bridge
義歯[gishi] artificial tooth
鋸歯[kyoshi] teeth of a saw
金歯[kinba] gold tooth

脆い[moroi] brittle
脆性[zeisei] brittleness
脆弱性[zeijakusei] vulnerability
涙脆い[namidamoroi] easily moved to tears

脆弱[zeijaku] frail
情に脆い[jounimoroi] soft-hearted
脆化[zeika] embrittlement
水素脆化[suisozeika] hydrogen embrittlement

加齢[karei] adding to one's years
学齢[gakurei] school age
月齢[getsurei] age of the moon
高齢[kourei] advanced (old) age
弱齢[jakurei] youth

寿齢[jurei] long life
樹齢[jurei] age of a tree
就学年齢[shuugakunenrei] school age
適齢期[tekireiki] marriageable age
年齢差[nenreisa] age difference