On my non-twink char (Name: Debate), a Level 77 Death Knight on Shu'Halo, I was absolutely destroyed by a level 70 druid. I got the druid down to about 25% health and then they healed up to 100, put those tangling vine things on me, and then killed me with a few spells. They were a Balance druid.
At the time I was not geared at all. I'm still not fully geared (DK is now 81), but props to whoever did this. Even though they were a 70 twink, I didn't expect them to kill me THAT fast. If they're on this forum...Props!