Is it normal to still have scalp numbness three years after a face lift?

Numb scalp. Just from a facelift there should not be any scalp numbness. However, forehead lift done at the same time, particularly the traditional coronal lift, will result in scalp numbness that may not ever completely resolve although should involve ever smaller area of the scalp.
Possibly. http://www.facialplastics.info/facelift.html unfortunately, numbness can be permanant in 1-2 percent of those that undergo a face lift. If you haven't already, i'd suggest following up with your plastic surgeon. Best of luck.
No, but... Scalp numbness should not usually accompany a facelift. However, it is quite possible/common after a brow lift, which is a procedure commonly done at the same time as a facelift. This is especially true if you had an incision that went along your hairline (a tricophytic incision). I would recommend discussion w your surgeon if it concerns you.
Numbness & Facelift. A face lift is rarely performed alone & may incorporate liposuction of the neck/chin, fat grafting, fillers, eyelid procedures, facial implants, forehead/brow lifts, chemical peels, dermabrasion, laser resurfacing, etc. Depending on the procedures performed, it is possible to injure nerves that supply the skin and provide sensation. Many of these will recover but it may be permanent after 3years.
Not normal. Though possible, numbness is a potential complication with any surgery of the skin. It is unlikely to get scalp numbness with only a standard facelift, but other concurrent procedures such as a brow lift can cause this symptom. It also should have resolved by 1-2 years, and there is little that can be done at this point. Good luck!
Maybe... A traditional facelift does not usually cause numbness of the scalp. However, if you had a concomitant brow lift, the numbness isn't "normal, " but can certainly occur and can rarely be permanent. I always counsel patients about that preoperatively. Discuss wih your surgeon.