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progeria, any of several rare human disorders associated with premature aging. The two major types of progeria are Hutchinson-Gilford progeria syndrome (HGPS), which has its onset in early childhood, and Werner syndrome (adult progeria), which occurs later in life. A third condition, Hallerman-Streiff-François syndrome, is characterized by the presence of progeria in combination with dwarfism and other features of abnormal growth. Progeria is extremely rare; for example, the global incidence of Hutchinson-Gilford progeria syndrome is...