Sophia Castiblanco, a high school junior, began investing at age 14 within Tesla, Apple, and Amazon stocks. She was successful enough with her investments to purchase her own Tesla vehicle. Castiblanco advocates for starting small with investing, even just $20 per month, and having patience as stocks can lose value short-term. She prefers investing in index funds to diversify risk compared to individual stocks. Her parents played a role in supporting her early interest in investing and business.