Most people definitely become wiser with age. Maybe the results are skewed because millennials are a particularly wise generation which have to deal with increasingly complex social, economic and environmental problems and this forces them to think more and ask more questions. Also, the internet has given millenials a big advantage in terms of finding information. It's not fair to compare one generation with another completely different generation; we need to track people from the same generation over a long period of time in order to get meaningful results.