You can easily know how to determine a website's domain age, follow all the underlying advanced SEO steps:
Visit WHOIS Lookup: Use domain WHOIS lookup tools like ICANN or domain registrars to find the creation date of the domain.
Archive.org Analysis: Visit the Wayback Machine on archive.org to see historical snapshots of the website. This can help you identify when the website was first active.
Domain Age Tools: Utilize specialized tools like SEMRush or Ahrefs to get accurate domain age information. These tools also provide additional SEO insights.
Backlink Analysis: Check backlinks to the website using tools like Majestic or Moz. Older domains often have more established link profiles.
Domain Registrar Data: Some domain registrars display domain creation dates. Check the domain registrar's information for this data.
Social Media Activity: Look for the oldest posts or interactions on social media platforms linked to the website. This can give you an idea of when the website was launched.
Google Search Index: Search for the domain in Google using "site:domain.com" to see when Google first indexed the website's pages.
Content Originality: Assess the originality and depth of content on the site. Older domains might have a more extensive archive of content.
Compare Domain to Competitors: Compare the domain's content and backlink history to competitors in the same niche. This can provide insights into the website's age.
Remember, domain age is just one factor in SEO. Quality content like 8171, relevant backlinks, and user experience are equally important for achieving high rankings.