Do you know these words?

• おとろえる（たいりょくが〜/きおくりょくが〜）

  to become weak (one's memory/strength) ; to lose one's strength/memory

• ろうすい

  senile decay

• おいくつ

  how old (for asking about age)

• おとし

  age

• こうれいしゃ

  elderly person