Which age groups have the highest prevalence of sporadic inclusion body myositis (s-IBM)?

Updated: Jun 08, 2018
  • Author: Michael P Collins, MD; Chief Editor: Nicholas Lorenzo, MD, MHA, CPE  more...
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Age of onset ranges from the late second to ninth decades. Mean age of onset is 56-60 years. [69, 64, 65]

While a large majority of individuals develop symptoms when older than 50 years, 17-20% present before the age of 50. [69, 70, 64]

The diagnosis of inclusion body myositis is often delayed by a mean of 5-8 years from time of symptom onset. [69, 64, 71, 70, 72]

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