A.P.
My son's gave them up between 12-14 months. My daughter is giving them up now at 14 months old.
Their morning naps were 9-10:15ish and afternoon naps are always 1-3 (the baby sleeps from 7:30pm-6:30am and the boys sleep from 8:30pm-7am).
My 14-month old now naps from 12:30-3. I figure she'll do this for a couple of weeks until she gets used to not having the morning nap and then she'll do the 1-3 nap with the boys.
About me: stay at home mom of 4-1/2 & 3-year old boys and a 1-year old girl.