The age of your scar is not important. In fact, the older a scar is, the better for scar revision. The unknown question is how effective any treatment to the area will be. The outcome of revision of scars can be quite uncertain and will depend on many factors including its size, location, depth, width, your healing genetics, and the type of treatment used (laser, dermabrasion, surgical excision).
Your best bet is to have it assessed by a local plastic surgeon.