I often fantasize about getting a blonde or a red hair wife.
But I have a problem. From what I have heard, blonde and red hair darkens with age. I would not like to marry a girl with blonde hair in her 20s only to end up with a woman with brown hair in her 50s.
Is hair darkening inevitable? Do some women retain their color? How can I spot who will retain their color and whose hair will darken?

Is red hair more "stable" than blonde hair?

I would also appreciate if you posted middle-aged celebrities or instagram models with natural blonde or red hair.

What board would be most appropriate for this question?