It appears that warriors that have achieved level 60 should be able to taunt lvl 60-65 mobs. As of June 04, 2001.
Extract: "A fix is currently in place which will allow level 60 warriors to taunt level 60 to 65 monsters. This should help warriors be more effective taunters and tankers in high level encounters.
Last Modified on: Monday, June 04, 2001"
https://web.archive.org/web/20010714...IEW.ASP?ID=291