Im 31 and have never been on the pill, we started trying just after xmas 2009 and I was preg within the month (Jan 2010)
I'd stopped drinking in Nov 2009 to get prepared and have never smoked, I have a healthy BMI.
OH (who is 28) cut back on smoking and I was taking vitamin pills - didnt do ovulation tests or anything, just took a guess at timing. I was just lucky.
My friends (all late 20's and early 30's) varied from 1 month to a year.
Everyone is soooo different, different lifestyles and stress in their lives, so many different factors involved that there isnt really an average. xx