This is a very common question. The best age to have a facelift depends on: anatomy, expectations, and surgeon.
First of all, if you like what you see when you pull in the mirror, there is a good chance that you are a candidate for a facelifting procedure. My younger patients are starting earlier as a maintenance and prevention strategy. They are not waiting until they have a lot of sagging or they look like an older relative.
When you start younger, your results may not be as dramatic. Rather, a younger, more refreshed appearance can be attained with subtle changes in before and after pictures. And, a scar tissue layer is created under the skin that makes the skin less mobile and more resistant to gravity in the future.
So, if there is sagging, a lift may help you achieve your goals.
Realistic expectations are key. Everyone wants perfection, even the surgeon. Keep in mind, perfection is not attainable, the goal is to get significant improvement that looks natural.
And, the most important decision you will make is the artist/surgeon that you choose. Some surgeons like to focus on the more traditional facelifting procedures, while other surgeons like to focus on smaller procedures. You should find a surgeon that is very well experienced performing all three procedures as this will allow you the most versatility in your outcome.
Best of luck, and let us know if you have any other questions!