Lowering/creating a hairline 2 centimeters is substantial and would require well over 1,500 for a convincing look with good density. At age 22 I simply would not risk it. I know that is not what you want to hear but using up 1,500-2,000 grafts to essentially build a completely new hairline could lead to serious problems later on if your native hair behind it starts to thin as you will have less donor grafts in the reserve. If the initial procedure fails or yields poorly, then you will have no choice but to use up more precious grafts in order not to look bizarre and you can quickly deplete your entire donor zone if this occurs. I would wait until at least 30 at a minimum and then analyze your options. I know this answer won't please you but you must be careful. All the money in the world cannot replace those finite amount of eligible grafts we have.