Domain Age plays a part in Google Rankings
Domain aging starts from when google indexes content, not when the domain was registered. It’s a well known fact that it (or age of backlinks) plays a role in rankings and is mentioned in the google algorithm patents. A site that has a history is less likely to engage in blackhat methods that a brand new domain.
The age influences the sites position in th results. Google gives more credit to the old sites.
As I mentioned the old sites grow easier.