Comments on these plugs please.

[Muleears]

Below are the six plugs I removed from my X this morning. I replaced them with the same kind (NGK Iridium). I am not a plug expert but these don't look too bad. Unfortunately I have no clue how long they have been in the X, they were there when I bought it. I do notice some carbon on a few, they all seem to have the tan color and no eroded electrodes. What do you all think?

If I had any brains I would have noted which cylinder each plug came from but I did not.