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!
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2015-08-10T15:03:15.543
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2016-10-13T01:03:40.483
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question
grammar particle-の
いくつになったら in this sentence
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.
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2015-08-10T16:12:57.180
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2015-08-11T15:53:33.113
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> 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。](https://japanese.stackexchange.com/q/39648/16344)
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