I phon 14 about know how to my apple i phon

The iPhone 14 was released in September, 2022. But there is no way to know how old your particular iPhone is. You can check it’s warranty status here→Apple - Support - Check Your Service and Support Coverage. If it is less than a year old that site will show a warranty end date, which will be one year after the phone was purchased. If it doesn’t show an end date it is more than a year old.