Identify a correct statement about glaucoma.

A) Glaucoma shortens one's stature by inches.
B) Glaucoma rarely occurs before age 40.
C) Glaucoma cannot be treated either by surgery or medication.
D) Glaucoma causes curvature of the spine.

Glaucoma is more common in older adults, with the risk increasing significantly after age 40. It is a group of eye conditions that damage the optic nerve, essential for good vision, and is often linked to a buildup of pressure inside the eye.