Friedrich's ataxia onset most commonly occurs at which age range?

• A. 0-2 years
• B. 10-15 years
• C. 30-40 years
• D. 60-70 years

Answer: (B)

Friedreich's ataxia typically begins in childhood or early adolescence, with most individuals showing symptoms around the preteen to mid-teen years. The common window is roughly 10 to 15 years old, which aligns with the disease’s progressive neurodegenerative course driven by frataxin deficiency from a GAA repeat expansion. Onset earlier in infancy is rare, and onset in the 30s or later is uncommon and often characterized as late-onset Friedreich's ataxia. So, the most typical onset age range is 10–15 years because it best matches the usual age when gait ataxia and related signs first become evident.