Q. We purchased an RF skin-tightening machine three years ago based on your articles. Do you know how long these machines last or, in other words, do they lose their effectiveness over a certain period of time?

— R.K., Minneapolis

A. For those who are unfamiliar, RF skin-tightening machines use radio frequency energy to heat up the skin under the surface, stimulating production of elastin and collagen and providing a natural facelift.

It really works, and I have used one for years.

If your machine is still heating up to the same temperature it should be just as effective as it was before. However, after approximately age 75 your body's response starts going down because your skin does not produce elastin and collagen as effectively. If you are younger than 75 it is good to begin a prog

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