When John and Cathy Engers' youngest son, Jacob, was diagnosed with Duchenne muscular dystrophy at age 5, they didn't know what to do.
After researching the disease, they thought he would live to be 16 or 17.
"Needless to say we were mortified," John Engers said.
Jacob Engers, now 22, defied their expectations.
His father credits it to advancements in treatment.
According to the Muscular Dystrophy Association, more men with the disease are now living into their early 30s, and others into their 50s.
Duchenne muscular dystrophy is the most common childhood form of muscular dystrophy and makes up about half of all cases, according to the National...