How do I know if a much older man is into me?

Im a 25F and I'm into older men. I've had a hard time telling the difference between attraction and just being friendly. The men I frequent around at my job are around 50 and pussyfoot around with mixed signals. I dont want to misread it. What are some subtle signs they are attracted to me or how can I open that door a little without scaring them off?

How do I know if a much older man is into me?
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