every time i remember keith made this face at lance after lance was being all smart and clever and sneaky while they were on the balmera mission i start to cry
I think by turians and humans having a lifespan of 150 years, they mean a maximum of 150 years. The oldest woman who ever lived was 122 and sure there's still quite a number of years until 150 but I think what they were getting at was given their advanced healthcare, humans in the years around 2100+ CAN live to 150 years. That's not to say they will though and that goes for turians too. So everything would still be the same. 18 for us is still 18 for them.