HOW DIABETES occurs in a youngones when they are 16 to 25 age groups.

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It could be type 1 diabetes,where in the pancreas is unable to produce any insulin.It occurs due to genetic inheritance.

[gangadharan_nair]

Type 1 diabetes may usually occur in persons below the age of 30.

Type 2 diabetes is a disease more commonly associated with adults. In fact, it used to be called adult-onset diabetes. But type 2 diabetes in children is on the rise, fueled largely by the obesity epidemic.

Sources:--

merckmanuals.com/profession...

mayoclinic.com/health/type-...