Lettuce update

It seems that my lettuce seeds are having a poor germination rate.  It has been 2 weeks since I planted them, and very few have sprouted in either container.  I was looking online and lettuce seed is supposed to have a 5 year viability and my seed is from 2007 and 2009. It is around 62 degrees in my shed, so not too warm for lettuce.  Not sure what the problem was.  Perhaps they will continue to germinate.  Not holding out too much hope...