老化 [ㄌㄠˇ ㄏㄨㄚˋ; lao3 hua4]
  to age (of person or object)
  becoming old
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  老化
  ろうか
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  nouns which may take the genitive case particle `no'
  ageing
  aging
  senile deterioration
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