The level 25 I mentioned was from memory, as I recalled the aggro threshold to be somewhere in the low to mid 20ies. To piece this together I did some digging but there is no hard number only indications that it's somewhere close to level 20.
For example the sarnak fort in lake of ill omen Chancellor of Di'zok, a lot of comments speak about adds, where to be to not gain aggro from roamers and clearing the room. Sarnaks there are level 21+:
http://eqbeastiary.allakhazam.com/search.html?id=3989
a goblin alchemist in permafrost level 23:
Comment from May 09 2003:
http://eqbeastiary.allakhazam.com/search.shtml?id=3599
Quote:
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I am camped in his room, so I just pop in every now and then see if he's in or not. Still aggroes at 45, but an easy kill. Spawned in the first five minutes today, dropped leggings, Bah! Still camping for cloak...
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a giant black widow (najena) level 18 - 22:
http://eqbeastiary.allakhazam.com/search.shtml?id=2151
Comment from Apr 25 2001:
Quote:
I hate these things
I hate Spiders and these ones are REALLY big! Not only that, but I'm level 45 and sometimes they STILL aggro, rarely, but yes, they are aggresive, they scowl at me with their icky 8-eyed faces... ew!
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I just picked some random NPCs, mostly notable ones that people spend some time to kill and looked at comments and guides about how to go about camping them. Judging by those level 20 or 21 is probably the threshold that an NPC has to be to still aggro, no matter what level the player is (frenzy aggro only, you should be able to single pull any green mob if you pulled from far enough away).
I'm sure there are older comments about aggro, but I guess the April 2001 comment is close enough for our needs. If someone else wants to read more old comments and guides on level 20ish mobs, then that might help to narrow this down even further.