A facelift turns the clock back so-to-speak about 10-15 years. Unfortunately, we still live on planet Earth and gravity continues to exert a constant force and the sun continues to shower us with ultraviolet radiation.
Most surgeons would say that a facelift lasts about 10 years. If you age slowly, then the facelift lasts longer. If you age quickly, then the facelift doesn't last as long.
Things like smoking, prolonged sun exposure, being in a bad mood all the time (scowling) and poor skin care will cause you to lose your results more quickly.
Excellent skin care, protecting your skin daily with sunscreen, combining a facelift with skin rejuvenation/resurfacing/tightening with nonsurgical Laser and RF and strategic use of Botox and fillers can do wonders to make a facelift last much longer than it otherwise would.
I hope this helps.