Where is Xzar and Montaron?
Dead? BG1 going by this: https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=675526#Post675526
, In-universe date of game: Starts on 1 Mirtul "May 1st" 1368 DR
BG3 going by this: https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=675618#Post675618
, in-universe date: possibly 1496 DR, must be a couple months or a couple years after Descent Into Avernus
128 DR difference, going by this: https://forgottenrealms.fandom.com/wiki/Marking_the_years.
DR is actual full years, at least as far as I could tell.
But I did see Minsc in Neverwinter Online which from what I understand is also just a human, so this guy should be dead as well.
I didn't get far in bg1 and just know these characters by the names, if there is actual lore that lets them live past normal lives I wouldn't know.
The Larian silly-ness I'm used to is generally missing/replaced with awkward events. DOS1 had willy mcwishing well, the two drunk guards Junius and Bibius, guard that was in love with a female orc, & zigzax.