<PRE><B>Question 672197</B>
&lt;br&gt;&lt;font face=&quot;Tahoma&quot;&gt;The younger sister can be at most 12 years old,&lt;br&gt;

since she is not yet a teenager.&lt;br&gt;

So, your friend could then be at most 24 years old or {{{2*12}}}&lt;br&gt;

In theory, your friend could then be almost zero years old,&lt;br&gt;

all the way up to 24 years old.&lt;br&gt;

For instance, if the younger sister was 1 week old, your friend would be 2 weeks old.&lt;br&gt;

But for the sake of this question, they wanted to know your friend&#39;s maximum age, not their minimum.&lt;br&gt;

In fact, there is no true minimum age that your friend could be, in theory.&lt;br&gt;

But practically, she would have to be at least a few minutes old if she was born as a twin with the younger sister!&lt;br&gt;

I hope this helps!  :)&lt;br&gt;

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