Does official source of data about air routes exists?
Such information is not available, for free, on a world wide level.

If you are willing to spend some money, you should have a look at Navigraph, which provides such information on a world wide level, for hobby use.

However, most countries now make their AIP publically available on the internet. Simply search for "[country name] AIP" to look up an AIP for a specific country.

In any AIP, you want to look at part 3 of the ENR section. Usually ENR 3.1, ENR 3.2 or ENR 3.3. Here is an example of from AIP Denmark: AIP Denmark ENR 3.3 - RNAV routes

This information is digital, official, up to date, free and in WGS84 format. However, you will have to look it up for every country.

If you are looking for a visual overview of airways and RNAV routes in Europe, a good place to start is the Eurocontrol regional charts.

You should also check out SkyVector