Here's why:
* Hair Growth Rate: Hair grows at an average rate of about 0.5 inches (1.25 cm) per month. Over a year, this can add up to 6 inches (15 cm).
* Nail Growth Rate: Fingernails grow at an average rate of about 0.1 inches (0.25 cm) per month. Toenails grow even slower. So, fingernails grow about 1.2 inches (3 cm) per year, and toenails about 0.3 inches per year.
* Hair Length Potential: Hair can potentially grow for several years (before naturally shedding), allowing it to reach considerable lengths.
* Nail Length Limitation: Nails are constantly subject to wear and tear, and long nails tend to break more easily. Most people keep their nails trimmed to a manageable length.