This claim finds itself seated firmly in the “confusing causation and
correlation” camp.
Because a website has been around for a long time and is ranking
well, age must be a ranking factor.
Google has debunked this myth itself many times.
In fact, as recently as July 2019, Google Webmaster Trends Analyst
John Mueller replied to a tweet suggesting that domain age was
one of “200 signals of ranking” saying “No, domain age helps
nothing”
The truth behind this myth is that an older website has had more
time to do things well.
For instance, a website that has been live and active for 10 years
may well have acquired a high volume of relevant backlinks to its
key pages.
- Domain Age Is a Ranking Factor
HOW TO SPOT SEO MYTHS: 20 COMMON SEO MYTHS, DEBUNKED