Best way to find out is to do a couple of weeks work experience in a salon. Hairdressing is a very physical job, not like sitting down doing nails.
Bear in mind that it takes most people around 5 years to become a good hairdresser, so you will be 47 trying to work a full column. I'm 43 and used to the work, and I am struggling physically nowadays.
Thanks everyone for your comments. It didn't cross my mind about the physical side. I'm fit and healthy just now but I'm a single mum with 2 boys under 4 which is physically demanding. I'll have a think. Thanks again x