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いくつになったら買ってくれるの？
I'm not sure of the grammar used in this sentence.
いくつ-> Does this still refer to how many?
になった->Is the なった here a conjugation of なる (To become)?
Also is the の at the end of the sentence the contraction of an explanatory の (e.g. the written form of んです)
Thank you!
I assumed that this sentence is used in a context where a child asks his mother/father to buy him something, yet the parent said no, due to the child being too young.
If translated directly, it would be something like "If I become how old, will you buy it for me?"
いくつ can be translated as "how many" or "how old", and in this case, I used "how old".
Omitting the details, なったら is a form of なった, which can be thought as a past-tense of なる。
About the terminal の, I don't know the correct grammatical explanation, but it adds the sense of questioning.
いくつになったら買ってくれるの？
How old do I have to be before you will buy it for me?
How long do I have to wait before you'd buy it for me?
How much more do I have to wait before you'd get it for me?
How many more years do I have to wait until I can finally get it?
About the terminal の？, it's probably short for のですか？
In the last few years, this ending has become common on the Net :
買ってくれるん？
-- which is short for -- 買ってくれるんですか？
There's also a [relative tense] issue. Please see: 相対テンス -- ①ハワイへ行く時、帽子を買う。 ②ハワイへ行く時、帽子を買った。 ③ハワイへ行った時、帽子を買う。 ④ハワイへ行った時、帽子を買った。
