I'm 38. I've been bleaching/dyeing my hair for 25 years 
My partner bleaches the roots then I put a toner all over.
I'm sick of it - it takes ages to do and is so dry after it's been bleached and takes weeks of conditioning treatments to look healthy by which time I've got roots again.
My roots look dark now (dark blonde/v light brown) with a few greys. I've put toners on before without bleaching first and no matter how 'ash' they are supposed to be they go brassy on the roots.
I don't want to go drastically dark, I don't want people to see I've got greys (not many!) and I don't want to go to the hairdressers more than twice a year.
Any advice? 