Not sure I buy the results though. I would think that the rate of increase would start to decrease quite significantly after high school/college but it appears to stay pretty much linear throughout the data.
Site creator here -- That has been the most interesting finding so far -- I certainly didn't expect it. Unfortunately I haven't had enough participation yet from children, or older folks :), to see how it continues to extend in either direction.
Not sure I buy the results though. I would think that the rate of increase would start to decrease quite significantly after high school/college but it appears to stay pretty much linear throughout the data.