Considering the retirement age to be 60, a person aged 25 should invest ₹7,200 in a monthly SIP to build a retirement corpus of ₹5 crore at nearly 13% expected rate of return, NDTV Profit reported. For people aged 30 and 35, the monthly SIP should be ₹13,300 and ₹25,100, respectively, to make a ₹5 crore by retirement.