Most people shift to a more conservative mix (less equity, more debt) once they retire and start withdrawing, so this is usually lower than the pre-retirement return. Your withdrawal itself is assumed to rise every year with inflation, not stay fixed.
The corpus is sized to fund your (inflation-rising) expenses only up to this age, not forever. A longer age means a bigger corpus, since it has to last longer.
Calculations are for illustration purposes only and do not constitute investment advice.
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