Staying out of the sun evens them out and most cosmetic treatments other than deep dermal chemical peel won't really work in the long term. Our dermis was designed to be relatively resistant to chemicals. You'd need something with a solvent carrier and those can have some severe consequences, CSE comes immediately to mind. Laser therapy can remove them and lentigines, although most of the studies have been done on Skin Type III. But if you wish to be rid of them forever look at short pulsed yag laser treatment.
At this point in my life I think I'd look weird without them.