When is the best age to date someone?

I'm not saying I want to date, i want to be mentally mature and well set off for a relationship. My crush recently confessed his feelings to me. I've had a crush on him for 2 years. I REALLY like him a lot and don't want to lose him but I don't feel that it's good for me to date just yet. I need advice from you wise people.

When is the best age to date someone?
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