Such people should invest in areas which have zero risks like depositing in "Saving Bank Account" or in government saving schemes, where rate of return is fixed and chances of investment collapse are zero. These options are best for old age people who are retired from jobs and can't actively follow stock markets and other trading options. Although profit is guaranteed in such schemes, your money is degraded in value due to inflation. To increase the worth of your investment you have to take a risk by jumping into trading options like equity or crypto market. And when you come to crypto market there is no way to become rich overnight you have to be patients, withstand worse market conditions, only then you are able to get good return.