Which factor does NOT typically affect nail growth?

Nail growth is influenced by various physiological and environmental factors, with diet, age, and climate all playing significant roles. Diet provides the essential nutrients required for healthy nail growth, including proteins, vitamins, and minerals. Age can affect the rate of growth, as nails tend to grow slower with older age. Climate also influences nail growth because factors like humidity and temperature can impact overall nail health and growth, as well as the health of surrounding skin.

The color of nail polish does not impact the biological process of nail growth itself. While it may affect the aesthetics of nails, it does not influence the speed or health of actual nail growth. Therefore, this option is the one that does not typically affect nail growth and highlights the distinction between external cosmetic applications and the internal factors that truly influence nail development.