いくつ
幾つ
ikutsu

Adverb

1. how many

Usually Written in Kana
いいえ、おもちゃがいくつあるかじゃなくて、鍵かぎがいくつあるかなのよ。
iie omochaga ikutsu arukajanakute kagiga ikutsu arukananoyo.
No, not how many toys, how many keys?
Adverb

2. how old

Usually Written in Kana
あなたのおとうさんはおいくつですか。
anatano otōsanwa oikutsudesuka.
How old is your father?