Cannot use free chat even though I turned 13 in Runescape

Possible reasons:

  • You are on a quick-chat-only world.
  • You got muted somehow. (Pmods can do that) --> Check your account for mutes
  • I've read that you get permanently muted if you sign up with an age under 13. (I don't know if this is true or not)

I know you don't want to do this, but I think you have to contact Jagex. You could ask in the Runescape forum for help or write an email. Contact the jagexsupport (@JagexSupport) via Twitter is also an option.