Your current exponential equation should have the initial value at the f(0). That means f(0) is the present time in which you received the initial $1000 and the inputs are the years since you received the money. What if you wanted to adjust the graph so that it represents the initial value of $1000 being received at the age of 21, so that all of the input value (x) is your age instead so that you know how much you have at a certain age, what would the exponential explicit equation look like?