Sowing Old flower seeds

I’ve started sowing old seeds. Turns out 2017 is old for self saved sunflowers. As none I started ( don’t remember when) have come up. Nearly all the packet of sunflowers I got with a magazine last year have all come up. So I’ve sown all my sunflower seeds. Didn’t count them, far to many. Just scattered them on top of the trays of no shows and put a little more compost on top.