If matter cannot be destroyed or created, does that means we are as old as the universe? ?

Matter or energy cannot be created and destroyed, but can be transformed. That means that atoms can change configurations to make new molecules and also that under nuclear reaction atoms can be transformed from one element to another. So, the answer is that from the same matter (and energy) that created the universe,...

Its energy cannot be created or destroyed, so Yeah technically our energy is old.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.