go for it!! i decided at 23 to do it, my nan was a hairdresser for 50 years she had retired now at 71 but she still does the odd clients at home. she proved to me there is no limits to what you can do.
on my college course the best student in our class was 55 and she was amazing. the salon i work in 1 day a week, im the youngest at 23 the other 2 who work there are 38 and 45. we all chose to do it later on and i feel we are all better hairdressers for it.
The only flaw i feel i have is that is that maybe im too cautious. some of the other younger girls on the course would love re styles ect but for me i thought more abouth the risk * what if they hated it and told all there friends * what if i lose my confidence ect
but again i would rather be over cautious and take my time, make sure you fully understand what they want to get the best outcome.
hairdressing is soo creative and rewarding. go for it!!!