[citation needed]
Is this really the case? If so why do salaries increase with age? What do you mean by "young"? The bottom half of living people by age? How do you explain the years our children spend in school generating no value at all?
The portion of kaizendad’s comment that I replied to specifically mentioned “output”. I interpret this to mean economic benefit or “value”.
The time students spend in school is time they are not working. Children generate almost zero economic benefit until they are out of school and the type of person kaizendad references is likely to spend a lot of time in school. Their economic contributions probably do not start until their late 20s.
I think a persons maximum economic output is probability closer to middle age than their early adult years. Perhaps kaizendad and I simply misalign on the definition of “young”.
Edit:
https://www.childtrends.org/indicators/youth-employment/
From link, "As of October 2015, 49 percent of all youth ages 16-24 were employed in any work, either full- or part-time. Youth enrolled in high school had an employment rate of 18 percent, while the rate for those in college, either full- or part-time, was 45 percent."
You have cited a problem. The fact that we make children work to support their families holds them back from being the ones who kaizendad refers to.
Children who have the benefit of education early on are more likely to be productive later in life.
I also had my first paying job at a young age. My economic benefit today is much larger in comparison and continues to increase year over year. My maximum economic contribution has yet to occur even though my youthful employment was decades in the past.