Do laser diodes have a shelf life?

I was looking at the Wicked Laser webpage and they state that laser diodes have a shelf life of 3-4 years. Two of my beloved greenies (Dragonlaser & WL Krypton) are 2014 vintage. Can I expect them to die in the next few years? I barely use them (<1 minute/day), but try to operate them at least weekly...and keep them in a cool and dry environment.

Here is the link: http://support.wickedlasers.com/hc/e...-of-the-laser-