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The factor that does not contribute to an increased failure rate in oral contraceptives for women under the age of 22 is age-related hormonal balance. While hormonal changes can occur at different stages of life, the effectiveness of oral contraceptives is more directly influenced by user behavior, such as proper use and adherence to the regimen.

Improper use refers to not taking the pill consistently at the same time each day or missing doses, which can significantly increase the risk of pregnancy. Similarly, higher inconsistent adherence generally correlates with increased failure rates, as infrequent or irregular use of the pill diminishes its effectiveness. The complexity of the contraceptive method can also be a barrier to adherence, particularly for younger women who may struggle with remembering the daily regimen or managing side effects.

In contrast, age-related hormonal balance is less significant in this context, as the primary issues leading to a higher failure rate are related to user behavior rather than intrinsic hormonal factors that change with age. Therefore, hormonal balance itself does not directly affect the efficacy of oral contraceptives in a way that leads to a higher failure rate for this age group.