When things began

Everything in the universe has a beginning. Here are some of those things that are still with us and when they began, listed by year:

-13,700,000,000 the universe, time, space, matter, energy
-13,300,000,000 stars
-12,600,000,000 Milky Way Galaxy
-4,570,000,000 Sun (but 30% dimmer than it is now)
-4,540,000,000 Earth
-4,500,000,000 Moon
-4,400,000,000 clouds, rain, the oceans begin to fill
-4,031,000,000 rocks (oldest known)
-4,000,000,000 life, DNA
-2,500,000,000 breathing oxygen
-1,200,000,000 sex
-900,000,000 swimming
-580,000,000 eyes, animals with bilateral symmetry
-550,000,000 brains
-540,000,000 hearts
-480,000,000 fish
-450,000,000 Appalachian Mountains
-425,000,000 land plants
-385,000,000 trees
-365,000,000 legs, lungs
-220,000,000 lizards
-164,000,000 hair
-160,000,000 birds, feathers
-150,000,000 North America as a continent
-125,000,000 flowers
-100,000,000 South America and Africa as continents
-92,000,000 ants
-80,000,000 Rocky Mountains
-66,000,000 grass
-55,000,000 Australia as a continent
-25,000,000 seeing in colour (among our ancestors)
-3,500,000 hands, technology, walking on two feet, eating meat (among our ancestors)
-1,200,000 black skin…