You can check the age of a domain by using various online tools. One common method is to use a domain age checker website. Here's a simple way to check the domain age:

Go to a Domain Age Checker Website:
There are several websites that provide domain age checking services. One example is "WHOIS Lookup." You can visit websites like WHOIS.net, DomainTools, or similar services.

Enter the Domain Name:
On the chosen website, you will typically find a search or lookup bar. Enter the domain name (e.g., example.com) for which you want to check the age.

View the Results:
After entering the domain name, the tool will provide you with information about the domain, including its creation date or registration date. This date represents the age of the domain.

Remember that these tools provide approximate information, and the accuracy depends on the data available in the domain registrar's database. Additionally, some websites might offer more detailed information, such as the date of the last update or expiration date.

Keep in mind that if a domain has changed ownership or if its registration information has been updated, the domain age may not accurately reflect the time the current owner has had it.