You're welcome. Interesting. I wonder, however, if the age of the QB is really a motivating factor for teams, or if it's just coincidental. For instance, I don't know how old Jameis Winston is, but Mariota and he were considered the consensus top two QBs in the 2015 draft. I would think that would be the determining factor in whether teams took them, not how old they were. I can see where for two QBs who are rated pretty equally the age issue might become a consideration, since they probably will have a two year shorter career than a 22 year-old QB who pans out. I can understand why teams would consider a 24 year-old more mature, and thus perhaps more desirable if everything else was equal, but in general, I would think teams would opt for the younger QBs.
Winston and Mariota were both 21. I think teams do generally opt for the younger QBs. But the data show that they still don't take seriously enough the negative consequences of taking older QB prospects. The reason is probably exactly what you're saying: the 24 year olds are more mature on and off the field, so the scouts like them. As a result, teams don't consider enough that these prospects usually won't improve enough to meet the expectations teams have of them.
