Can your skull/head decrease within size?

Can the skull/head decrease within size, 21 years old and i swear my head gotten smaller..

Answers:

What does it mean when you ............?

NO not possible
within an adult the bones own reached maximum size and fused.They no longer can increase in size(except in definite bone diseases)-then they are deformed-but they cannot decrease contained by size

Why does hair turn gray and is in that any research for a way to prevent it?

not really but your brain can. Maybe your paw size grew

What is the part of your body you want to rearrange?

Not really, maybe if you lost solidity you lose size around your skull. If not better see a doctor.

my penis is bigger?

if you lost weight