As I grow older why is it harder for me to see?

As you grow older, less light reaches the back of your eyes. Your pupils get smaller as you age, and the lens inside your eye becomes thicker, absorbing more light. The lens also scatters more light as you age, adding a "luminous veil" over images on your retina, which reduces the distinctness (or contrast) and sharpness of objects and the vividness of colors. Reds begin to look like pinks, for example. You might have an even harder time seeing differences in blue colors, because your eye's lens absorbs more blue light.