There are many well‑known people who go by “AJ,” so “how old is AJ” has no single correct answer without more context.

Common people called AJ

  • AJ McLean (Backstreet Boys singer) was born on January 9, 1978, which makes him 47 years old in 2025.
  • AJ Shabeel (YouTuber) is listed as 29 years old and is a Dutch-born content creator.
  • Anthony Joshua (boxing champion, often nicknamed “AJ”) was born October 15, 1989, so he is 36 years old in 2025.

What you can do

  • Say which AJ you mean (for example: AJ McLean from Backstreet Boys, AJ Styles from WWE, Anthony Joshua the boxer, a YouTuber, or a friend/classmate).
  • If it is a private person (not a public figure), that age will usually not be publicly available for privacy reasons, so it would be necessary to ask them directly.

If you tell which AJ you are asking about, a more precise age can be given.

Information gathered from public forums or data available on the internet and portrayed here.