I'm seeing 180 years average lifespan for half-elves in 5e. Not sure how old Jaheira was at the end of BG2. Viconia - could go either way you are right. As for the comics - am fairly sure they are canon? Here's hoping anyway. Slight spoiler - I did find one reference to them in EA, but that's it. There were some other elf and dwarf characters from BG1 & 2 (and a gnome or two) that I wasn't nearly as invested in - but I'd imagine they might still be around as well.