Life is so fragile. So short, yet so long.
It is astonishing how we can percieve time.
Think about it from one perspective. You've lived 'x' years. What happened during that time was EVERYTHING for you. Thousands memories, billions of stimuli bombarding the brain.
Just go take a walk around the city, sit on a bench, close your eyes. Feel uncountable fotons touching neurons on your face. Hear multiple sounds surrounding you; each one of them is a vibration of air caused by a vibration of some thing. Billions of atoms vibrating, in such a 'brief' moment as second. A soup of particles and energy. And that's just one sound amongst others. People chatting in a cafe near you. Their brains starting a cascade reaction: electricity through neurons, making their vocal cords resonate, vocal cords making air vibrate, your ear recieving the stimulus(eardrum, hammer-anvil-stirrup, nerves, brain).
Think about all the things happening on the entire Earth, just in that particular moment when you're sitting on this bench with your eyes closed, engulfed in the mini-universe of your mind. Then think about all the events in the Universe, happening just in that particular second. All these atoms in motion, a sea of atoms, an ocean. This is "just" a second. And how many of them have passed, since, let's say, 2 months ago? 2 years ago? Decades? Millenias? Millions of years? Billions of years?
Another perspective - everything you've experienced in your life - that's just few decades(or less). Millions of people were born, millions of them have died. Millions of conciousnesses like yours, millions of such complex things as described earlier. In macro perspective, 70 years of human life is nothing. People get born, grow up, finish school, marry, become grandparents and then die. Time speeds up like a cargo train going downhill.
It is insane though, that when you think about it, entire YOU, your conciousness, your mind, EVERYTHING about you existed just for these few years. Before - void, nothingness. Now - everything. It's not like 100 is 10x10. It's more like difference between 0 and 1. Existence/non-existence.
It is insane though, that we can percieve things. How is colour a colour? How is sound a sound? How is touch a touch? A thought a thought? If brought down to smallest pieces, it's about transfer of energy through atoms, neurons etc., in bigger scale it's about activity of neurons, neurotransmitters, encoded memories. But again, HOW IS COLOUR A COLOUR? How do we have the conciousness?