The typical lifespan of a gaur is from 15 to 20 years, although the maximum recorded lifespan is 26 years and 3 months, with a theoretical lifespan ranging from 13 years and 1 month to 26 years and 3 months; the species reaches sexual maturity from 1 year and 10 months to 3 years and 1 month. The young are born with their eyes open and begin walking immediately, undergoing an embryonic stage where the fetus develops inside the mother and receives nutrients via the placenta. Following birth, the calf enters a juvenile stage lasting from 6 months to 1 year, during which it stands quickly and feeds on its mother's milk. The species then transitions to an adult stage, lasting from 3 to 20 years, where the animal is capable of reproduction and independent living.