Our life expectancy and education is literally thousands of years ahead of anything they have. You can argue about violence, capitalism and religion, and I'd agree, but parts of our culture are better then theirs in easily measurable ways.
I doubt there is a single part of our culture that is "better in an easily measurable way". This includes life expectancy, which of course cannot be "literally thousands of years ahead".
However, by definition it is very difficult to measure life expectancy of isolated people. First you must contact them- which starts to change them. Second, you must determine their age, which is a difficult task.
The real problem is that using life expectancy by itself is misleading- it mostly represents access to emergency medicine and antibiotics, and the harshness of the environment. We can keep people alive in the USA for a very long time, but that doesn't mean they are healthy.
It was only relatively recently that the overall health of a person living in an agricultural society came to be comparable with the health inferred from ancient hunter gatherer skeletons.
There is no way to objectively 'measure' whether their lives or ours are better spent or more enjoyable.