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My EE laid her first egg at 28 weeks. I have a blue wyandotte that hasn't laid yet... let's see (getting out the calculator) she's now 35 weeks old, big and poofy with red comb & wattles! She's holding onto her eggs for ransom, I say.
I'm not sure there's an average, with the differences in breeds, etc. 21 weeks seems on the early side, though not abnormally early. I have 2 birds that laid at 24 weeks old.
To your question about cold weather/short daylight... yes, I've read here on BYC, that a chick who reaches point-of-lay in fall/winter, when days are dark, will often wait to begin laying until early spring.