It's worth noting that:
* People go gray at different ages. While some start seeing gray hair in their early 20s, others don't notice it until much later.
* Celebrities often dye their hair. It's common for actors and actresses to dye their hair to match a role or for personal preference.
Therefore, it's likely that if Keri Russell does have any gray hair, it's being covered up. However, we can't say for sure without more information from her or reliable sources.