The best age to start dating?

Personally, I think the best age is at 20 to 21. It all depends on the development of the person and their maturity. I know not all people are mature at age 20 but they are the exception and not the rule.
Some mature at 13 while others are children at 40.
What do you think? I think a person at 20 can start thinking long term and not just fulfilling his desires.
No need to comment that dating is haram, just answer the question hypothetically or ignore it.