Wikipedia- note carefully the part about AGE OR APPEARANCE. No, I do not, in fact, think Wikipedia is wrong.
Also of note is that both the anime series AND the light novel series state QUITE PLAINLY that despite their age of 76 years, the twins are still considered children by Dark Elf society's standards; Ainz himself states as much during the 'Ruler of Conspiracy' arc. They played and lived with other Dark Elf children during 'The Half-Elf God-Kin arc', which was to help them 'develop' as Dark Elf children... All of this is easily found with a few minutes of research with Wikipedia, or simply watching/reading the series--no "AI slop" involved at all-- something you plainly either did not do, or did not expect us to have done.
You keep responding, and we keep slapping you down... but don't take my word for it-- Go look it up. Any fan is going to know this, and the resource material is on Wikipedia, Fandom.com, literally dozens of other fansites, anime reviews, light novel synapse and reviews, and of course, the source material itself.
Your argument that he is not Lolisho is, of course, incorrect, as by Wikipedia's definition (you yourself have touted Wikipedia's info to be 100% correct in this very conversation) as seen below on their page, it is young OR young appearing.

(image credit: Wikipedia)