Question 1141565
.
<pre>
Jack is one year old =====>  hence, Jane is 2 years old.


By knowing it, you will easily answer the question of the problem:  Jennifer is 2 + 13 = 15 years old.    <U>ANSWER</U>
</pre>

-----------------


May God save you from solving this simple problem by the way @josgarithmetic does it . . .