I work for a law firm and the lawyers and paralegals need to have a certain number of CLE (Continuing Legal Education) hours every year to maintain their licence. I know Doctors do too.

The point I was making is that the base of information does not change for them like it does for IT, and the base of information is more important to them. We don't care about all the nuances of the SMTP protocol 99.99999% of the time. Do I care at all about COBOL or RPG? Will I ever use that knowledge again? Do I care about a token ring network, 10base2? Will I ever need to again?