Earlier than most people think, and for a reason that has nothing to do with vanity: less tissue to move means a more natural result.
Facelifts reposition tissue that has descended. In the late forties and early fifties, that descent is moderate and skin still has elasticity, so lifting produces a rested look. At seventy, the same operation must move far more tissue, and the result — while still good — is a bigger change.
It lifts; it does not resurface. Fine lines, sun damage and volume loss need lasers, peels or fat transfer. Patients disappointed by facelifts are usually those who wanted a skin-quality change from a repositioning operation.
A skin-only lift pulls the surface and relapses within a few years, and it is the technique that produced the 'wind tunnel' look. Deep-plane surgery repositions the SMAS layer, so tension sits below the skin and the result lasts 8–12 years.
Threads, ultrasound and radiofrequency devices tighten modestly and temporarily. They are worth doing in the forties to delay surgery; they are not an alternative once there is real tissue descent, whatever the marketing says.
Typically 8–12 years before a further lift would be considered — ageing continues, but from a younger baseline.