At what point is a pullet called a hen?

[Egg Rookie 2010]

I see some folks saying they eat pullet eggs and also hen eggs. At what age/point in development is a pullet a hen?

 

[7L Farm]

I've always heard one year.

 

[ragerkid2]

1 year of age

 

[centrarchid]

pullet = subadult female
hen = adult female

breakpoint / criterion is POL = point of lay = time or age when first egg layed.

Hen after laying first egg.