Warts, especially plantar warts, are a common problem encountered primarily in children, adolescents and the elderly.  This does not preclude adults from also having warts, although it is less common.  There also seems to be a genetic component, as warts are more common in families with some individuals having a higher prevelance of warts among family members.
Brandt R Gibson, DPM
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Podiatrist, Neuropathy Doctor, Father of 11 and Founder of Mountain West Foot & Ankle Institute