How normal is it to have 0 colds during an age-year of your twenties, and how do you celebrate if you do?

While I cannot post my exact age, I would like to know how "normal," with the average 20-something getting about 3 colds per year, would it be for a person in my age bracket (especially a woman, since men average fewer colds in adulthood) to go from one birthday to another without getting a single cold, flu, or contagious illlness of any kind? I've had calendar years like that when I went from January 1st through December 31st of the years 2005 and 2009 without a single, solitary day of illness, but because of my DOB it has always worked-out to where I got one at every age-number of my life. But what if this year is different in that I turn the next year older without ever being sick, feverish, under the weather, etc. at this age? And what should I do to celebrate or to make it known to others that, "I never had a cold when I was such-and-such years old?" (That rhymes, too.)