I have been having electrolysis since I was 40 (I am now 71). If I hadn't had it I would have, not just a few hairs, but a beard to rival DH's. It is the price I pay for a, still, luxuriant head of hair.
I have found it very effective, it does destroy the individual hairs, but there are an awful lot of hairs on ones face and as each one becomes coarse and bristly it needs treatment. For 20 of the 30 years I have been having treatment I have only needed three or four treatments a year. I had one last week and do not expect to need another one before Christmas.