Is 6 weeks too young to start grower feed?

[vizmiz]

I have 2 Americaunas, 1 Australorp, and 1 Buff Orphington. They are close to 6 weeks of age and the lady at my local feed shop said that the grower feed would be ok at this age. I am looking online and everyone is saying close to 8-10 weeks. Any tips? Thanks!!

 

[HEChicken]

I start mine on grower from day one, since it is easier with a flock of mixed ages to feed grower to everyone and offer oyster shell on the side for the laying hens.