You have my sympathy. Being shy can be quite limiting.
You might want to find someone you know more about and feel comfy enough to talk with. Perhaps you can join some social clubs or activities? Can your friends introduce you to some single men closer to your age?
Back to his level of interest. If he was interested, it would seem to me that by now he'd have walked over and started a real chat with you. After a few incidences of this gazing dynamic, it gets a bit weird. The fact that he hasn't walked over to chat might not be such a good sign. I'd pass on this guy.