The reason Susan had a higher balance at the age of 65 is because she invested earlier than Bill.
What is an Investment?
An investment refers to an act of dedicating an asset for the hope of attaining an increase in value over a period of time.
In this case, even with lower investment value, Susan will be able to have higher balance because she invested for longer period than Bills.
In conclusion, Susan had a higher balance at the age of 65 is because she invested earlier than Bill.
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