You guys are looking for someone to make a guess about the viability and cleanliness of your "unknown" stored yeast. 1 month will be much more viable than 9 months FWIW.
Most likely always best to make a fresh starter, on the other hand, what you have will likely work, but the results may vary as always (good, bad, indifferent), really up to you????
Whatever you do, smell it for freshness, if it smells like baby puke, toss it out, cheers!