What is so magic about attaining 21 years? Do we suddenly become wise and mature on the 21st Birthday?
https://www.urmc.rochester.edu/encyclopedia/content.aspx?ContentTypeID=1&ContentID=3051
A snip:
“The rational part of a teen’s brain isn’t fully developed and won’t be until age 25 or so.
“In fact, recent research has found that adult and teen brains work differently. Adults think with the prefrontal cortex, the brain’s rational part. This is the part of the brain that responds to situations with good judgment and an awareness of long-term consequences. Teens process information with the amygdala. This is the emotional part.”
If this is your criteria how far do you propose to take it? Why not deny all adult rights and responsibilities until the age of 25? Certainly driving is a responsibility no 16 yr old should be allowed, based on your single article. Nor should anyone below the age of 25 ever be trusted with weapons of war, I suppose. But, press your point with the public at large and let’s see how far you get. And, what do you propose for the elderly when mental capacity begins to diminish? Who makes the decisions for these people? Another scientist writing another article? This is thin ice in my opinion.