トリニティ・スタディの「4%ルール」に基づき、早期リタイアに必要な目標資産額（FIREナンバー）、達成年数、CoastFIREを可視化。
Generates $50,000/year in perpetual passive cash flow adjusted for inflation.
Your CoastFIRE threshold today is $134,043. Congratulations! Even if you never save another penny, your current investments will grow to fully fund your traditional retirement by age 65.
\text{FIRE Goal} = \frac{\text{Annual Expenses}}{\text{SWR}\%}, \quad \text{CoastFIRE} = \frac{\text{FIRE Goal}}{(1+r_{real})^{65 - \text{Age}}}Computes capital target based on sustainable withdrawal rates and discounts back to determine baseline asset threshold.
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