fox - I think I would take the 18 mo old hens over the POL s. You will have to quarenteen either, so you may as well get the eggs while doing so! If they go into a molt, this would be a good time to worm if you think that might be necessary. The 18mo olds have only gone thru 1 laying cycle, so you should get 2 or 3 more decent cycles at least, plus your other birds should be begining to pick up the slack with spring here. Best of wishes wich ever way you go! .....stan