How about "Skyrim Style"
http://www.uesp.net/wiki/Lore_talk:Argonian
In the race selection window in Morrowind it says something along the lines of, "In the male phase they are strong and dumb" yadda yadda " and in the female life phase they are weak and witty". This clearly suggests they change six halfway through their life, and should be looked in to.
This is indeed interesting, and may well be related to the dialogue of some Argonians in Oblivion. City-Swimmer (an Argonian female) for instance, refers to herself as male: "Does anyone see City-Swimmer? Is he gliding beneath the silver water? Is he creeping 'round a corner, hugging a wall, silent as a shadow in the dark." 77.161.184.122 11:29, 11 June 2008 (EDT)
Although, this would hardly be the only case where an NPC was referred to using the wrong gender pronouns in Oblivion, and it's not just Argonians. However, I have heard something (I forget where) about the life phases and the possibility of a change of gender at some point in their life cycle (though I'm not sure it's necessarily at the halfway point, or that it's always male-to-female, or that it happens only once even). The fact is that very little is known at this time about the physiology of Argonians, so until Bethesda sees fit to give us a little more to go on, we can only guess at the specifics. --TheRealLurlock Talk 12:17, 11 June 2008 (EDT)
Or, that could just be a minor typo in Morrowind(because it never stated that in oblivion) and as the above comment stated this isnt the first time in Oblivion that a gender confusion statement has been made by an NPC but then again I could be wrong--LuciusZelgius 20:56, 22 November 2008 (EST)
Even if they do change gender halfway through life, it cannot possibly be the same for each one...Look at Ocheeva and Teinaava. They're twins, but one's female, one's male. This would make them precisely the same age...but different genders, denying that, if they do change gender at the midpoint of life, it is not the same for each individual Diamantus 14:12, 6 January 2009 (EST)
It would be interesting to have a six change forced on you 50-200 days out from the start of your game.
As for appearance, more Oblivion than Morrowind. Normal feet with a little more lizard-like features thinner body and smaller head, it would be nice if the tail swayed on it's own while idle. [Same for Khajiit as it concerns the tail]