How do you tell if someone is extended?

[EdwardWarlock]

Fighters and clerics can easily break 3k base health in 7x.

My fighter was str/spr lvl 68 and had 3k odd hp unbuffed.

This is true. A pal of mine had an honest fight with me, and his HP was around 3.2 at 70 even.

If you have really good friends, ask them to let you smack them around a few times to get a good damage ratio. That's how I can tell. I view someone's HP (damn near always a fighter), chuck a spell at them, and you can pretty much determine from the damage output if they are charmed or extended. If they real honest, just ask them what their level is, and then the answer will become quite clear.

Another Note: As of late, watch out for charmed Enchanters! If you see a mage with more then 5.5 HP, get the hell outta the way, because he's extended. And as Hessah already said, people walking around in PvP buy the charms as well as the extenders. I think it's stupid, because almost no one fights straight up anymore, even without the in-game buffs.