First time I went on a date I was 23 years old. Before that with all the studying and work I had no time whatsoever for any kind of a relationship.
Some people on this thread bring up that dating let's you develop a skill. In my experience dating is pretty easy if your goal is a long-term relationship, you just need to be yourself. If the other person likes you for who you are and not appear to be it's a very good sign. It is also incredibly easy being yourself, less mental gymnastics. If you are after casual hookups... Here you do need a skill (unless nature gifted you with good looks). I suck incredibly hard at this.
Another thing is that once girls get older (25+?) they start to value other things, so all these hookups you missed in your younger years don't matter that much.