Explain Compound Interest in a Way That Changes How You Save

Everyone says start early and almost nobody explains why in a way that sticks. This uses your actual numbers: what compound interest does mechanically, what a one-year delay costs over 20 years in real money, and when the interest your money earns outpaces your monthly contribution. One concrete example is worth a hundred explanations.

Explain compound interest using a specific example based on these numbers: [describe your current savings or a hypothetical amount and a realistic interest rate].

Explain it across three levels: (1) the mechanics in one paragraph, using the numbers provided; (2) what a one-year delay in starting saves costs in real money over 20 years; (3) the point at which the interest earned per year exceeds the amount you are adding each month.

End with one sentence about what this means for when to start, not how much to save.