It depends on the guy. Some starting at a very young age, some at a very late age. It's like girls. It depends on their personality and how they were raised. But everyone knows that teenage guys are the ones showing the most interest between a child and a teenager.
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It depends for every boy. A lot of boys can even start developing "crushes" in pre-school. Most serious crushes occur in middle school and high school. There is no certain age to start developing a liking for a girl or a crush.
Boys can start showing interest in girls as early as elementary school, around ages 9-12. However, the intensity and nature of this interest can vary greatly from person to person. Puberty usually marks a time when romantic interests and attraction become more prominent.
Teenage years,a good Age is 16,15 is good but I wouldn't leave them alone cause boys put pressure on us girls to do things we don't wanna do