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The results also showed that fingernails now grow by 3.47mm every month â almost twice as fast as toenails. The nails of younger people and men grow faster. The little finger nail grows much more slowly than other fingernails, at a rate of 3.08mm each month. The middle finger has the fastest-growing nail.
The speed of nail growth changes throughout a person's lifetime. Infant nails grow more slowly than adult nails, but children's nails grow more quickly than those of adults. Nails tend to grow the fastest between the ages of 10 and 14. After that, growth begins to slow, and continues to slow with age.