They would be meaning playing DOtA since age 7. The original DOtA has been played since pre-2005 under various guises. Dota 2 is largely identical to the origin

They would be meaning playing DOtA since age 7. The original DOtA has been played since pre-2005 under various guises. Dota 2 is largely identical to the original dota as far as gameplay goes. Exactly where DOtA starts and ends can be a little bit fluxy. It has evolved in a rolling fashion over many different patches that often tweak gameplay in large ways.