Your eyelashes naturally thin as you age. For the most part, you shouldn't be overly concerned with it. Your lashes are like the hair on your head. It grows, rests, shed's, and regrows.

Why are my eyelashes becoming sparse?

Age – Eyelashes naturally thin as a part of the aging process. Medical Conditions - A medical condition such as blepharitis, thyroid disorders, alopecia, inflammatory diseases, skin cancer, and many other diseases could cause eyelashes to thin.

Can sparse eyelashes grow back?

Just like the hair on the scalp, eyelashes have a natural growth cycle and frequently fall out. The loss of a few eyelashes is normal. However, extensive eyelash loss can occur for several reasons. In many cases, eyelashes will grow back without treatment.