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.

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.