What is the minimum selling age for chicks?

hen broody considering asking mum if raise small clutch of chicks. we've done before, , timing - holidays!
however, have few questions. dont want unfair on chicks @ all, age can chicks sold? , how old before ready outside on own? how old must able survive on own without mum or incubator?
when last raised chicks, 4-5 weeks old when moved, along our hen, went friend after them while on holiday, , after kept it. 4 weeks old seemed old enough, want make sure. definitly under 3 weeks early.
thanks

my hen broody considering asking mum if raise small clutch of chicks. we've done before, , timing - holidays! however, have few questions. dont want unfair on chicks @ all, age can chicks sold? , how old before...

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