8 month old hens only one is laying

[Me + Peeps]

I have three 8-9 month old wyandotte hens and only 1 lays. is there anything that can help them start? is it possible they will never lay?

 

[Firework]

They take longer to lay than other breeds.

 

[Uppity Peon]

Sheesh... I sure hope mine are laying by that age!