Kissing I think around maybe 15 or 16. Dating I think should not start until one of the people can drive, preferable the guy. It'd be awkward to have to have a parent drive you to dinner and pick you up. So, dating around 16. Hope this helps! :)
It's different for everyone but the average age for a first kiss is fifteen years old. The average age in the U.S to lose your virginity at is 18 to 19. These are only statistics and numbers, losing it at one age or another is unique to only you.