Different age pullets

[Wyatt0224]

Hello everyone! I don't know if this is the right place so please forgive me if its not.
I have 15 chickens total but they're all at different ages. I have 2 Silkie pullets at 16 weeks, 2 ba pullets at 15 weeks and five 9 week old rir pullets. So my question is I know I need to start thinking about laying pellets soon for my silkies but when do they start laying eggs? If they take awhile to lay can I wait longer to give them laying pellets so my other hens can catch up?

 

[Poultry parent]

you can continue giving them the feed they are getting now with free choice oyster shell until the others catch up