Garnering 35% of the votes, 2 to 3 years seems to be the age when a majority of parents teach their tots how to use the toilet. This was followed closely by 18 months to 2 years (31%) with 12 months to 18 months coming in behind at 17%. There were 8% of lucky parents who tossed the diapers between 0 and 12 months, and 10% told us they were still wallowing in diapers. We say, don't despair! They'll get there eventually.