Good question to ask, since Sarah is a redhead.
The following article says that studies claiming redhead extinction by as early as 2060 have been published by an organization linked to Procter and Gamble, but in reality, as long as redhead genes continue to stay out there, redheads will continue to appear in some frequency.
In fact, dark brunette Kirsten might have a recessive redhead gene, and that may cause Sarah and Kirsten's love child to become a redhead too - though the story will be over before the child's birth.
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