Most Popular Common App Prompt & Age Question??

Hi, does anyone know what the most popular essay prompt is on the Common App and the least (besides the new prompt)?

Also, I’m thinking about doing prompt #5 “Discuss an accomplishment or event, formal or informal, that marked your transition from childhood to adulthood within your culture, community, or family.” and was wondering whether age 14 or 15 still counts as childhood.

I’m almost positive the most common is the first prompt; and I’m not too sure which is the least popular, but I’d assume it’s the one discussion failure.