I think it's best to get started on dating early. My first could-be-called-girlfriend was when I was 11 years old. I learned some things. My first serious girlfriends were when I was 15, 16; I also learned some things, and not only was it a learning experience, it was very nice; I still think about some of the times we had back then. It was really surreal. Stuff like laying on the grass looking at the stars; getting the first taste of independence, and going to jog together in the morning; introducing the S. O. to parents. Learning how to act in front of an S. O.'s parents. etc. My first fiance was when I was 17; I learned a lot of things. Like not to get married.
And, I think it's good to get attached to someone early on, because chances are it's going to fall apart, and you're going to be really upset over it. I think it's good to feel that early on, so that you know what it's like when you're grown. And that you also develop a bit of caution in just throwing yourself all in.
22 is way too old to start dating. Then you have no practice. You don't know what to do. You need the experiences to really be good at it. That brings up something. Dating as an adult is significantly different than dating as a teenager, though... But, I still think dating as a teen, or even as a child, can be a good learning experience. Well. Maybe it's not so different for women; I don't know. But expectations for males jumps up like over 9,000. But, the typical dating is the same, more or less. Which means getting experience early on means you're all the better at it as an adult.
Also honestly. Why miss out on the youthful joys? I don't get it. Why put it off willingly? I would understand if it was like sex; caution should be used at a younger age. But just dating? No reason not to as early as possible, in my opinion.