[imaginenore]

Everything that has mass, must experience time. That includes electrons, protons, neutrons, which are considered fundamental.

[riskable]

To put it another way: Time cannot exist without mass. Time only exists because everything is always in motion (at least a little bit) and--in our perception--we have a memory/frame of reference.

From the perspective of a photon it lives and dies in an instant. Even if it crosses the entire universe!

[danbruc]

Protons and neutrons are not considered fundamental because they are made out of quarks and gluons.

[explorer666]

Mass is also an emergent property.