Unfortunately that is not completely true, especially in the short term. If you are relying on organic search traffic for your product or site, no matter how good it is, you may have difficulty being found, especially if the product has a common name. Aged websites (+1 year) have a large advantage vs any site less than a year or even 3 months old. A site with a high number of backlinks and a good domain (EMD) will be extremely difficult to displace. Fortunately SEO is around 40%-65% onsite these days and so if you do have a good product and service it is possible you will rise up, although it will be less likely if you do not have optimized on-page content and structure (like Sitemaps).
Of course aged websites have an advantage against the short-term thinker with a 3 month old site, and that's how it should be. The chances that an established site that has a record of being regularly updated with fresh, relevant content has more useful content than a new, 3 month old site, is higher (but not guaranteed). This is as it should be: those who put in more work to create useful content should win for higher, more relevant placement.
