In DMV, who makes the age requirements for driver licenses (you need to be 18 for motorcycle license, which is stupid)?

Your state legislature made that law.  DMV can't change it, no one AT DMV can change it. The end. 

why is it stupid? Because you are a stupid kid?

If you are under 18 who pays for the damage you do?

To hard to sue a pathetic child under 18.

Sad you live in such a behind the times place.

In my area to get a learner's driver's licence you must: be 14 years of age.

  If learning to drive a motorcycle, you must be 16 years of age.

Maybe you should move to South Dakota, North Dakota or Montana.

WHO decides? The law makers. Write your representative to express your concerns.

I agree, they should make the minimum age 26

The head of the DMV and the state legislators decide those rules (laws).

Grammar matters.  Yours is pathetic

The guy who sweeps the floors.

Let's figure this out together.  DMV is a State agency.  Who controls the State?  Government officials.  There, problem solved.

State Governments make laws.  DMVs follow the laws.

The state legislature.  The DMV just issues licenses. They don't make the laws.  

The DMV just uses the laws that your state government sets.  If your grandmother thinks that it will keep her grandchild safe to raise the motorcycle age, then she will vote accordingly.