The maximum age of H. erectus is unknown, but the average lifespan is only about four years (Lourie et al. 1999). The maximum reported size is 19 cm (Lourie et al. 1999), although most specimens are smaller (Robins & Ray 1986). In captivity, H. erectus maintained a linear growth of 0.55 mm per day for a period of 100 days (Scarratt 1996). Specimens larger than 20 mm have been reported to grow an average of 0.11 mm per day (Matlock 1992).
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