No set age, usaully 6-7 months or in that ballpark. Mostly it's based on when they need to be at the backgrounders and still allow at least 45 days weaning period
I can't even remember what a normal year should be like :shock:
If conditions allow around 8 months seems to be ideal for my conditions. In an extremely good year add a month or 6 weeks, as a rule in a drought everything over 4 months are weaned. Lately that 4 months weaning seems to be the norm here.