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The purpose of this study was to compare the voluntary and evoked, absolute and normalized leg extension rates of torque development (RTD) and rates of rise in electromyography (RER) during commonly reported time intervals in young and old men. Fourteen young men (21.9 ± 3.2 years) and 16 older men (72.3 ± 7.3 years) completed three evoked and three voluntary isometric leg extension muscle actions to quantify absolute voluntary (peak, 30, 50, 100, and 200 ms) and evoked (peak, 30, 50, and 100 ms) RTD and RER. All RTD values were normalized (nRTD) to peak torque, while RER values were normalized (nRER) to peak-to-peak M-wave amplitude (M_PP). Absolute voluntary RTDs and RERs were 58–122% and 70–76% greater (p ≤ 0.05) for the young men, respectively. However, there were no age-related differences (p > 0.05) for voluntary nRTDs, absolute and normalized evoked RTDs, or voluntary …