I want to add: I don't think "caring" means that somebody coded from early youth on or works another 40 hours per week on side projects. All I mean is that somebody is curious about the systems he/she is working with, explores things, stays at least a little informed about latest trends, maybe reads some blogs, thinks about ways to do things better, is able to criticize himself/herself (it's a good sign to be embarrassed about something you did years ago), learns more about the tools he/she is using than strictly necessary, tries to understand the bigger picture.

All this can be done in a 40 hours week. No need for overtime or starting at age of 3.

During a one year project I see a lot of people who barely grow during that time. Others grow a lot because they put in a little extra mental effort. That's the people I like to work with.