Am in early 50's. Up until last year I was literally covering the emerging greys every few weeks. Having read a couple of threads on here about embracing the grey I decided to start going lighter so had some caramelly highlights put in to disguise the regrowth. Did this a few times and the growing grey kind of merged in quite subtly but unfortunately the process ruined my hair and turned it into the texture of candy floss 
Bits started breaking off so I ended up with a wodge of hair a lot shorter than the rest - not a good look !
A few weeks ago I bit the bullet and have had it cut into a pixie. Cut's great but I really feel that the grey massively ages me - I've also noticed that most women with short hair are also grey so I irrationally feel older ! I'm almost at the point of dyeing it to a warmish brown again - got a castings from boots - but really dont want to get into the vicious circle of dyeing again Any advice from people who've persisted with the grey or not would be great !