Intellego Vim of 90 is darn high. I did an intellego magus who's best from is Vim here: https://forum.atlas-games.com/t/adelbert-a-magi-of-hermes-look-at-intellego-and-astrology/8146/1. He has affinity and puissant in both intellego and magic theory
Using 30 xp per year and doing all of the lab work with actual totals ( that is never taking 30 levels per year). His InVi lab total 120 years out of apprenticeship (Int + aura+ MT + In + VI + familiar) is 86. I didn't give the familiar full xp so she certainly would be capable of a few more levels of magic theory and an aura higher than 3 could be justified. He could also have done something to his lab (he never had the time) and even as it is he could use a more intense lab routine to get his total to 90.
So yes it is doable, but if you want it done by a magus less than a century of age they'd need to have an applicable focus or be really monomaniacal about
it.