Do you get ill very often?

I don't seem to get ill very often at all. I was spewing up for a night in November and i had a cold for 2 or 3 days last summer (!?!?!?) but other than that nothing else in the last 18mnth - 2yrs.

Surely such good health can't be wholly attributed to keeping myself fit?
I don't come into contact with young kids so that avoids a lot of the bugs that do the rounds. Also, i try to avoid stuffy artificial heat as it feels unhealthy to me, so for instance i use the car heater but with the windows open and i keep a blazing coal fire going of an evening but have a door and window open and avoid using the rad's unless the wife insists.

Hope i dont jinx myself now as I hate being ill. (Obvious statement if ever there was one. I mean, who likes being ill?)