Life lived with optimism and a positive attitude. 
 The oldest teenager in the world , American Sam Burns , died Friday of severe genetic disease . 
The
 teenager was suffering from Hutchinson-Gilford syndrome , a disease 
that affects one in 8 
million newborns , and that only 200 children 
suffering in the world . All children are suffering 
because their lifespan lasts only 13 years . 
While
 he was alive , Sam was an inspiration to thousands of people around the
 world because of 
optimism and positive attitude they had towards life . 
"
 Although I have a lot of obstacles in life , I do not want anyone to be
 sad for me," he said on one 
occasion , writes Fox News. 
Burns was full of enthusiasm , although osteoporosis  his bones , and weighed only 25kg.
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