Seph ate way more than I did , I doubted he could always eat like that and yet keep so skinny ... Both of us crept up the stairs and said goodnight to eachother . I settled down into my bed and tried to sleep . Rain lashed at the windows , and thunder shook the entire house .
According to the above context, answer the following question.
What may be the reason why they do n't think Seph will stay skinny ?


Metabolism slows down as you age .