Lagers need a BIG starter. Check out the site called mrmalty.com. There is a yeast pitching calculator, and I would guess that you should have about a 1 gallon starter for a lager, especially for expired yeast. The yeast will still be good, but it'll take a while for them to revive and ferment the starter. 10 hours is really too quick for a starter anyway- a couple of days is more realistic for an ale yeast starter, and 5-7 days for a lager starter is more realistic. I like to make a small starter like you did, wait a day or two and "step it up" by adding another quart of 1.040 wort. Let that ferment out, and then do it again. Then, I stick my lager starter in the fridge (once it's fermented out) and decant the spent wort. I pitch the yeast when the yeast is 48 degrees, and the wort is 50 degrees for all of my lagers.
Hoped this helped!
Broken Leg Brewery
Giving beer a leg to stand on since 2006