Nobody has mentioned that there are 3-year master programs in ID. Quite frankly, they should offer these instead of a 4-year undergrad because it removes the liberal arts prereqs. Yes, I see the irony.
Anyhow, the first year of these programs are designed to give you the foundation classes and the other 2 years are ID. It gives you the equivalent of an undergrad degree in 3 years. It also gives you the freedom where you can push yourself into areas beyond the typical undergrad degree. Older students typically have more discipline and they can excel beyond an undergrad program if they choose. Not all do.