Is it possible to develop an allergy to beer in your 30's?

I stopped drinking beer a few months ago, largely for the calories, I switched to Gin and soda, it has about 1/5 the calories. And tonight I had one beer after work and got bright red, and I have had this happen in the past, occasionally I would get flushed when drinking beer, maybe a few times a year, but after I drank quite a bit. But not normally.

I am Caucasian, so I don't have that enzyme deficiency that some Asian and Indian people have towards beer. This has never happened to me after just one beer in my lifetime, it was quite shocking. I was maybe half way through my pint and the people at my table noticed it and I went to check in the washroom and was totally red faced.