Consider the list of multiples of 5


    5  10  15  20  25  30  35  40  45  50  55  60  65  70


Add 1 to each of the number from the list


    6  11  16  21  26  31  36  41  46  51  56  61  66  71


Now by "trial and error" method, find the numbers in the last list, that are multiple of 7.


The numbers you will find, are  21 and 56.


Now make one year step back.


ANSWER.  Her present age is  EITHER  20  OR  55  years.

It all depends! If Susie is a person, then she could be 20, 55, 90, or maybe even 125. Two of many other multiples/ages are 160 and 195. 

With these ages, you're venturing into the lifespan of whales, jellyfish, and sharks - a few of the creatures that can live very long.

Another CLUE would have to be given in order to arrive at a specific age, if thatw's the intended goal. 

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