Why do eyes never change, not the colour, the shape

When checking ID when people want to buy age restricted things, if the picture on the passport or whatever is old and doesn't look like them, I can tell by looking at their eyes and the eyes on the picture, they never seem to change even if everything else does.

Because its written in their DNA.

Our eyes change very little over the course of our lives. Babies seem to have big, beautiful eyes because, well...they do. Our eyes are almost the same on the day we're born as they are on the day we die. Our eyes are pretty much the same throughout our lives, and the patterns of tiny blood vessels in our retinas are all different, like our fingerprints.

@Anna. That's an excellent observation and very correct. Good catch! The eye ball itself doesn't change much, but our faces do. Good thinking. A thumbs up from me to you.

yes it does sagging skin over your eyelids can give you a completely new eye shape if it sags enough