User blog comment:Leviathan2186/Old Humans in Mass Effect/@comment-8419211-20130726074023/@comment-1440333-20130726232505

It could also have been an upper estimate - for example in the Western developed nations it is not unheard of for people to live to the 110s or 120s. Its not common however. Perhaps the 150 years life is not the common, just the highest that can still be classed as occuring regularly. The actuall life expectancy could be closer to 110 - similar to how the modern one is about 80.