Well it actually depends on your site quality. it not only depends on the age of website, it depends on many factors like onpage optimisation which includes, keyword optimisation, content optimisation, site url structure, sitemap, etc., after that you need to build quality links for the targetted keywords(which should be choosed using keyword tool to select high search volume with low competition keyword).
when you consider and do all the above explained factors effectively. then its possible for you to index and make your site rank in google for all the targetted keyword in just 3 months of time.
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