You could reeze them around 5-6 months as mentioned and take some stress out of your Christmas preparations (plus livestock is easier to look after in October than December if you're
a wuss like me temperature sensitive
) , or wait until June / July and have them fresh. Too old = less tender meat.
They need a lot more space (turkey pooh = chicken pooh x 100) and they'll roost up in a tree given half the chance. They need a good shelter as well as they don't do too well in cold, wet weather.