New Delhi, Aug. 22 -- Building a Rs.5 crore corpus may seem like a distant retirement goal at first, but it is achievable through consistency and the power of compounding. If you are wondering how much money you should invest every month in just mutual funds to achieve this figure, the answer actually depends on when you start.

A 25-year-old investor has 35 years to let compounding work, while someone starting at 40 has only 20 years. The size of your retirement corpus also depends on factors such as your current salary, expected annual increments, monthly expenses and future financial needs.

While some expenses may rise with age such as health insurance premium, others such as children's education costs and EMIs may eventually reduce o...