There is no age limit. Some know that they are gay from a very early age (3 for instance) some don't realize until they are young adults. It may be obvious to you from a young age or much older.
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How old should you be to "become" heterosexual?
You don't become a lesbian, you are born as one and you most likely discover this later in your life (meaning that usually children under certain age haven't discovered their sexuality yet, so they can't possibly know what gender they're attracted to).
Sexual orientation is not a choice. If you find yourself attracted to people of the same gender, it is important to embrace and accept these feelings. It is essential to prioritize your own happiness and well-being above societal expectations.
If you are a lesbian, you "started" being a lesbian when you were born. Most lesbians realize their sexuality in their teen years, even at 13 or younger.