Such cute faces I've been wondering a while about monitors having any age-related changes too. At just over a year mine is now a calm, confident and handleable individual (though I've never force-handled him). My BP seemed to be more active when she got to the 1200 (ish) mark. My parrot suddenly became a horrible, uncontrollable monster when he hit just under 2 and he's been the same on and off ever since