As long as the facelift is modified for the pattern of aging in each person's face it should always look natural regardless of how many have been performed. It is also possible to perform a facelift on someone who was made to look unnatural by a previous facelift and make them look better. Just because someone has a facelift, it does not prevent them from being able to have another one at some point in their lives. After a facelift, the results should be permanent when performed correctly, however, aging will continue. The patient will age from a new set point. Regardless of whether or not another facelift is performed in a patient's lifetime, they should always look better after the first one than if they never had it done, even 20 years later. It should be 10-20 years before another surgical treatment may be in the treatment plan, however, this will also depend on the patient's goals, genetics, lifestyle, health, environment, etc. Theoretically, there is no limit on the number of facelifts that someone can have. It should be in the treatment plan if it will address whatever component of aging is visible at that time. Each time it's done, the plan and vectors of tightening will have to be different. There will likely be less skin removal with each subsequent facelift.