[mundo]

They certainly would've had better nutrition than most people - as I recall from reading about this quite fascinating topic some years ago, the men who joined the Templars were generally quite rich, mostly the sons of the nobility. (They were also required to donate all of their money and land upon joining, which is how the Order became so preposterously wealthy) I would imagine that the rich had much higher life expectancies than average, regardless of whether they joined the Order.