Is Minoxidil a good option to thicken/preserve my temple areas?

In in my opinion, it would be helpful to get a hair consultation from an expert. You need a history, examination with magnification and possibly blood work. Most likely your hair loss is from androgenic alopecia.Should this be the case, minoxidil is an excellent starting point. In addition nutraceuticals, low level lasers, PRP, finasteride, and topical proteins can all be effective for androgenic Alopecia.Jeff Rapaport MDCore Aesthetic Realself

Some temple area recession is normal even at the age of 18.  If you have a genetic predisposition for hair loss, minoxidil can be a great starting point.  It may be a good idea for you to meet with a doctor to determine the cause of your hair loss, and if it is androgenic alopecia, minoxidil along with or without prescription for finasteride (Propecia) is an excellent, affordable option for treatment of male pattern hair loss.

If the changes in the hairline are due to androgenetic alopecia, minoxidil is a possible option. Be sure to review benefits and risks with a physician. If the cause of the hairline changes is hairline maturation or another cause, minoxidil may or may not do anything helpful.