What is it?
Picture this, when you were a newborn, you knew nothing about the world. Your mother fed you, bathed you, kept you safe. One day, you were a toddler, and you slowly but surely figured out how to balance on your two feet. later on, you figured out that moving your legs let you move by waddling, waddling became walking, walking - running, running - jumping, hopping, Skipping, and leaping! ... let's slow down a little, what you just did there... is called Growing up, aging, becoming more mature... the terms change.
