Albert Einstein famously quoted, “Compound interest is the 8th wonder of the world”. Those that understand this and save early will be richly rewarded.
Especially if like you suggested, they spend less than they make!
I heard an amazing story of a man that started as a janitor at a steel company. He noticed that they threw out the scraps of unused steel. He would collect the scraps in his beat up pick-up truck everyday and turn them in for cash.
Today his is a millionaire from the work he was willing to do when others just looked at the scrap as garbage. The compounding over the years was key.