Learn English – A question about age comparison

comparative-constructionscomparison

John has two daughters, S and X.
S = 18 years old
X = 9 years old

Now, if I want to compare their ages, how do you say it naturally?

I have written these three sentences,
do they sound good to native speakers?

Sentence 1:
S's age is twice as old as X's age

Sentence 2:
S's age is twice X's age

Sentence 3:
S's age is 2 times older than X's

After reading the comments and answers, I still don't understand why sentence 3 is not correct, Could you explain it please?

Best Answer

Of the sentences you've suggested, the only one that makes sense is

S's age is twice X's age.

A more common way to say it would be:

S is twice X's age.

However, the sentence that I would use is:

S is twice as old as X.

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