I never understood why so many people go to the trouble of paper towels, scratching the seeds, soaking for 24 hrs, etc. Just plant those things in your medium and let em pop. Don't get me wrong, i know all of those things (or most of them) will improve your chances of germination, weed out infertile seeds, etc. But in my personal experience I have had very few seeds never sprout sowing them directly into the pot or using a rapid rooter or jiffy plug. As for issues with old seeds, I keep a seedbank of veggie seeds, some as old as five years now. First, if are not stored properly in a cold, dark, and dry environment, they will either have a lot of trouble sprouting or will never sprout, regardless of your germination methods. Second, not only is the cold good for storage, it mimics the winter season when the seed should be dormant, then, when coming out of the fridge, it is like warming up in spring, a signal to wake up and get ready to sprout. Cannabis does not require this, but many plants do, and most seeds will sprout quicker if taken from a cold environment and then planted. Lastly, you would be right on seeds being too fresh. When harvested from any type of plant, the seed must go through a drying or curing period where its outer shell hardens and it becomes ready to wait for the next season. If this is not done and the seed is replanted too early it will not sprout, this is like a survival mechanism for the plant, if seeds drop then the weather warms, all the seeds wont sprout and then die in the winter, they will wait till spring and then thrive in the summer. Wow, that's what two huge dabs will do to a post, ok, i'm done now.