When you're born, your eyes are about 16.5 millimeters in diameter. ... When you're in your 20s, they're fully grown at about 24 millimeters , a little larger than a peanut. Your eyes don't get bigger in middle age. They only grow during childhood and your teens.

Are your eyes the same size from birth?

When we're born, our eyes are about two-thirds smaller than they'll be when we reach adulthood. Our eyes grow over our lifetime, especially during the first two years of our life and during puberty when we're teenagers.

Are all human eyeballs the same size?

Conclusion. The size of a human adult eye is approximately (axial) with no significant difference between sexes and age groups. In the transverse diameter, the eyeball size may vary from 21 mm to 27 mm.