I am in love with a woman who is 30 years older than me. DOn't know what to do?

I fell in love with her (she's 60, I'm 30) 2 years ago. She started flirting with me and I got hooked. We see each other every 2 months or so for coffee. I know she is attracted to me and that she has some feelings for me but I am afraid to ask. She brought up the LGBT topic last time and I didn't say anything. I am leaving town and I probably won't be back before at least 6 months. When we said goodbye, she gave me a peck on the cheek. I gave her one too. I wanted to cry but I remained calm. She is really busy and I am always afraid of bothering her so I don't contact her very often. I am afraid more than anything to tell her how I feel because she may shut the door. It's going to be a nightmare being away from her for so long. What should I do?