The Tree Years Old is an unburnable talking tree in Windemere.

When talked to, the tree says
"I'm tree years old.. HAW HAW HAW!", to which Dink replies
"That is also the LAMEST thing I've ever heard."

When hit with fireball, hellfire or a bomb, the tree says
"Your magic is treely useless against me.. HAW HAW HAW!"

Experts report the Tree Years Old is indeed quite annoying, and innumerable Dinkers worldwide have attempted to burn it with various magics and items, to no avail.