As someone who has written extensively about anti-ageing, I consider myself fairly sanguine about how I look (no Botox, no fillers, just a lot of good face cream). A few months ago, however, I was photographed by a Visia machine, a facial-imaging system that analyses everything from your pores to your pigmentation and tells you how old you look. I had it done once before, 20 years or so ago and, at the time, was annoyed to be told that I looked an underwhelming one year younger than my real…

