I got a flu-like bug in October 2009 and a cold in February of this year.
I get a lot of mild sore throats, but I think that is a hayfever/allergy thing. Preservatives in soft drinks/cakes/alcohol set it off. So does dust and pollen.
Generally I am much healthier in my old age than in my youth.
BUT if I go on the Underground in winter (or to a Mall) I guarantee I will catch a cold. So I don’t do those things.
I eat a pretty healthy diet of fresh organic food (no meat), don’t smoke, where possible I wash my hands before eating or preparing food and I try to keep my hands away from my face. I don’t drink much alcohol any more.
If I get symptoms I eat MASSES of raw garlic. Yummy.