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Between the ages of 35 and 50, people's vocabulary finishes developing, and the people have jobs and are have families with them. So they are viewed as "productive" members of society.
https://www.theatlantic.com/health/archive/2015/03/the-smartest-age/387862/

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old people they are looked at like they are wise and can help with many things

https://www.ramdass.org/embracing-aging-within-society/

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Based on this article they are the ones that are becoming adults and are open to change.
http://www.pewsocialtrends.org/2010/02/24/millennials-confident-connected-open-to-change/

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33 because by then you should have your life somewhat together
https://en.wikipedia.org/wiki/Ideal_age

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According to this article: http://www.businessinsider.com/best-age-for-everything-2017-3/#arithmetic-skills-peak-at-50-16
On average, Life satisfaction peaks twice, once at age 23, and again at age 69.

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20s because that is when people start their lives and careers. It is also when society gives people more responsibilities.
https://www.theatlantic.com/health/archive/2016/01/when-are-you-really-an-adult/422487/

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Young adults. This is when people start their lives and are being educated to make sure they are going to be successful.
https://www.oecd.org/education/skills-beyond-school/EDIF%202013--N%C2%B010%20(eng)--v9%20FINAL%20bis.pdf

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I believe 30s because they are all matured and are getting their life in order
https://www.standard.co.uk/lifestyle/london-life/30-reasons-why-you-should-look-forward-to-turning-30-a3360121.html

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mid 20's because that is when you have the chance to do whatever you want and "start over". People start making their marks in the world. http://www.businessinsider.com/6-financial-perks-of-being-in-your-20s-2016-8/#-4

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adolescents, people always say  "children are our future"  https://i.pinimg.com/736x/51/7b/32/517b322907cc15fb77f90d7cfaf206bf--gentle-parenting-quotes-mindful-parenting.jpg

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30s because people are less criticized for their "immaturity" like younger ages. They also are not made fun of for not being able to take advantage of the newest parts of technology and society's cultural changes like older ages http://time.com/247/millennials-the-me-me-me-generation/

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elderly people because "they have seen it all . The phase of our life is already experienced by them , they know what we are going through and can guide us through the unknown"  http://listdose.co/10-reason-why-we-should-respect-our-elders/

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30 because 80% of life's most defining moments take place around this age http://bigthink.com/experts-corner/is-twenty-something-the-defining-decade

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Elders are embraced in society. There is acceptance in themselves and who they are. They have the most experience and knowledge.
https://www.agingcare.com/articles/how-to-embrace-old-age-178747.htm

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Millennials because they are on course for success
http://www.pewsocialtrends.org/2010/02/24/millennials-confident-connected-open-to-change/

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people in their 20s because they are seen as people who are changing the way society works and finding new ways for success
http://www.goldmansachs.com/our-thinking/pages/millennials/

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35
you can be president so obviously the country thinks you have your life together enough if they trust you to run the country
https://constitutioncenter.org/blog/why-does-a-presidential-candidate-need-to-be-35-years-old-anyway