I think its depends on what you look like, i see some people who are in there Fortys/Fifties and they look daft, but some women in that age group look really good, also i think it depends on how you look after it, there is nothing worse than long unconditioned, straw like hair, if its like this chop it off, but if its healthy looking and suits you then leave it long. I am 46 & my hair is long, i will cut it if i think it starts to age me or gets unhealthy.