d4vd was 16 years old for most of 2021.

He was born on March 28, 2005, so:

  • From January 1 to March 27, 2021, he was 15.
  • From March 28 to December 31, 2021, he was 16.

So if you’re asking generally “how old was d4vd in 2021,” the accurate answer people usually mean is 16 years old.

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