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You can vaccinate at any age, but the earlier the better. One day old is ideal. There is some evidence to suggest that later vaccination offers some benefit, but in general, the idea is that if you wait for very long, they will probably already have been exposed to the disease. Here is an...

Just something to watch for, many chickens develop symptoms at around 20 weeks, the period when they come in to lay. It's a stressful time on the body. At some point, all you can do is practice good bio security, quarantine any new arrivals to the flock, and accept that you can only do so...

It really depends on the strain of the disease. Most chickens will be exposed to Marek's at some point during their lifetimes. This is why it is usually much more lethal for younger chickens than for older chickens, who have presumably developed some resistance. We had a one-year-old survive...