Originally Posted by Beerthoven
You could always make a starter to boost the cell count if you're worried about it. There is nothing wrong with doing that with dry yeast; I've done it more than once.
+1. If you are that concerned, a starter will alleviate them. Any which way, do you really have that much to lose? Seriously, you found an old kit. Even if you paid for it originally, it was money lost back then and it is now considered free. And if you didn't pay for it, well, it's free. I look at it as nothing to lose but the time to make it. I say make a starter and verify the yeast viability. And when that's proven, make a beer. I'll bet that the yeast is still good if the temps were where you say they were.