How do aliens achieve a life expectancy of thousands of years?

Why we live very short, as opposed to extraterrestrials that reach thousands of years, is an intriguing question with several explanations.

Since Adrian Dvir's book does not explain this phenomenon, I asked via direct channeling and logical thinking. 

1. Extraterrestrials often live in other, less dense dimensions, which translates into a high life expectancy.
2. Aliens have a very slow metabolism that causes a very slow rate of cell death.
3. Aliens are genetically adapted to their environment almost perfectly.
4. Aliens have ample leisure and are busy doing things they love and know how to do best. (optimal lifestyle)
5. Aliens have no ego, and although they are very accomplished, they are not competitive because of a predetermined destiny.
6. Extraterrestrials live without environmental pollution and pathogens, so their immune systems do not need to strain and deplete resources and life energy. 

The answer explains why human life expectancy is relatively low and why a sharp increase in human life expectancy is particularly challenging and cannot be achieved with drugs!

Continue reading: An encounter with superior aliens will fundamentally change humanity.