Calves four months old are much easier to feed and manage in a drought situation. (See Agnote DAI-15 Feeding calves in drought-June 1999) Calf age at weaning Calves are generally weaned between 8-10 months of age. The actual age depends on several factors: Feed availability-cows can continue lactation without losing condition in good years, but early weaning should be considered in drier years.