The average kissing age is usually 13-15, those are the years you will typically have your first kiss the most average kissing age ever is 15 in my studies because you typically find more people to have your first kiss with.
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The most popular age for a first kiss tends to be around 15-16 years old, as this is a time when many teenagers start exploring romantic relationships and physical intimacy. However, the age can vary greatly from person to person based on cultural, personal, and individual factors.
I'd estimate most people have their first kiss around the age of 13, however there are lots and lots of people who have it earlier or much later.