How do you find pictures on theme for a collage?

Question

"You dont have to be old enough to do something major or on your own."

Answer 1

I would put pictures of child geniuses such as:
Akrit Pran Jaswal, India's Child Surgeon - Child Genius
as well as many others. Also amazing kids in history, young actresses and singers or the 13 boy who went to colllege

Answer 2

pictures of babies, crawling, walking, drawing, any "first" in anyone's life. who knows how old any indiviual is going to be before we tackle a "first" in our lives. ie: First tooth, first word, first time we crawl, first time we walk, first smile, first picture we draw, first kiss, first love, first day at school, college etc. The world is still full of miracles and it only takes a moment to see something major going on in someone or somethings lifespan. That is the way I interpret the question. Good Luck.