So I'm going to make a beer with a OG of 1.077. I just made a 1000 ml yeast starter with a wyeast pack from may 2013. I went to Mrmalty.com and used his calculator and it said that I need 5 vials of yeast for my starter and that my starter needs to be 3.74 liters. First off is this yeast even still good, the calculator is telling me that its only 10%viable. I plan on stepping up the yeast starter after two days on the stir plate, but I have never stepped up a starter so I'm not sure how much new wort I need to add to get up to 300 billion cells. Should I be worried that the yeast is from May, it is only 10% viable. Since the yeast is only 10% viable do I have enough time to get it up too 300 billion yeast cells? Thanks in advance.