This is mind bending fact that reflects philosophical aspect. This needs to be explained.
First Law of thermodynamics and the age of universe
First law of thermodynamics also known as law of energy conservation which states that energy can be neither created nor destroyed and it can be only transferred from one form to another. So, today the energy is the same as the beggining of universe.
Subscribe to Physics Only Youtube channel
Then Einstein theorized mass-energy equivalence. so, matter is also form of the energy.