Wrist
The most important aspect of the tattoo is what color your tattoo is and not the length of time that you had the tattoo. It is easier to treat if you have a black tattoo. Difficult colors are the greens, pinks, yellows. You should not have a problem with treatment just because the tattoo is five years old. Please find an experienced dermatologist in your area for treatment.
As long as long as they are on separate areas, there should be no issue. If one overlaps the other, then the ink will be harder to remove.