What age should students start learning about Sex Ed?

Roo🌸
Note: - by Sex Ed I don't mean schools only teaching about puberty, but also including talk about safe sex, masturbation, lgbt+, etc as a whole.
- I know not everywhere provides lessons in Sex Ed but this is a hypothetical scenario that does. 
- (Bare in mind puberty starts for most girls at around age 9-14, and 12-16 for most boys)
Bonus: what age did you first learn about sex ed? And did you gain enough crucial information to guide you?

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