A 35-year-old woman with fair skin and a family history of melanoma is at risk for melanoma due to all factors except?

The risk factors for melanoma include several individual characteristics and environmental exposures. In this case, the woman's age does not significantly contribute to her risk for melanoma in the same way that other factors do.

Melanoma is more commonly diagnosed in adults but has a wide range of ages; thus, being 35 years old places her in a demographic where melanoma can occur, but it is not a defining risk factor. The other options represent more established risk factors: fair skin, especially in individuals with light hair color, increases the likelihood of skin damage from UV radiation, and a history of heavy sun exposure directly contributes to the risk of developing melanoma due to cumulative UV light damage to the skin.

Therefore, while her age is a consideration in the overall context of melanoma incidence, it does not independently elevate her risk compared to the other factors listed.