Hair Transplant to lower a naturally high hairline?

Hair lines can certainly be lowered with hair transplants. A picture of yours would be helpful but hair lines are corrected by hair transplants most frequently. For the most natural result you need to find an experienced team and would also suggest the FUE (follicular unit extraction) method as it leave no linear scar. There is a board certified plastic surgeon in Atlanta that does what is called Neograft who is very skilled.

Greetings,
It is hard to find doctors for forehead lowering since they need to be experts in 2 areas.  First of all, doctors need to be experts in facial plastic surgery or plastic surgery to lift up the scalp area and advanced along the forehead.  The galea is released during this.  A key component is hiding the scar along the border of the scalp.
The second component is being an expert in hair transplantation.  The hairline is lowered and the scar is camouflaged through hair transplants. 
Look for a surgeon specializing both plastic surgery of the face and who does hair transplants.
Best,
Anil Shah 

You can do a Google search or find a list of doctors on the ISHRS website.  You need an exam by a doctor and understand the risks and benefits associated with the surgery.

Yes, you can lower your hairline with a transplant.  It sounds like you're a good candidate for this as you have no baldness in your family.

There are many people, like you, who are dissatisfied with their hairline. Hair transplantation can indeed be considered as an option for lowering a high hairline. One technique is the use of tiny punches to remove grafts and insert them strategically into the hairline. This will not leave a permanent linear scar.Forehead reduction surgeries are also available. This is done by actually removing a section of the skin and closing the wound through sutures which will leave a linear scar along the hairline edge. Although grafts can be used to cover this scar, most patients find it more sensible to avoid creating this in the first place. Also, consider the ability of the surgeon to render a realistic looking hairline by creating a gradual progression from thinner to thicker hairs. 

Regardless your age it is possible to make a hairline lowering but photos would be helpful to give a precise advice.

Hair transplants are a consideration especially if the hairline has an irregular shape. Sometimes a hairline advancement operation can work for a young man if the existing hairline shape is what you want lowered and the new height would be at a mature level. Pictures would be helpful to allow for greater amount of information. 

The hair line is where your scalp hair borders your forehead and frames your face. bringing out your facial  features.  Therefore one of the most critical decisions in hair restoration is determining where to place the new hair line.  This decision should be discussed with your hair restoration specialist very carefully.  The best hair line recreated by transplantation is one that is natural and blends with your other features.  This requires a lot of artistic as well as surgical skill.  The physician should take into  account the facial contour, ethnicity, gender, age, hair characteristics, patients desire, expectations, type of donor selected, graft placement, size of grafts and the overall technique to ensure a natural appearance.  These need to be discussed to make sure you get the desired appearance and density  with your hair transplant specialist.