how long has planets been around for

Question: how long has planets been around for
- Keywords:
  age,
  planet,
  solar system,
  space
Asked by anon-186547 to Raquel, Danny on 13 Nov 2018.
- Danny Ward answered on 13 Nov 2018:
  
  The oldest known planet identified by NASA was found to be 13 billion years old. New planets are forming all the time though. For example, the planet we are on, Earth has been around for just 4.54 billion years! Its a baby in comparison 🌍

Question: how long has planets been around for