Falheim may be old, but he is hardly incapable - snow-white hair may fall to his shoulders and bristle at his eyebrows, but his build and stature speak volumes of the sheer amount of the word 'military' compressed in the man, or at the very least 'military experiences'. Hazel brown eyes capable of an extreme range of expressions from utter joviality to murderous intent wander about quickly, judging people without giving a damn about what they might make of it, communicating information to either hands well worn from wielding the greatsword almost permanently strapped to his back or overtly-expressive eyebrows and mouth.
Oddly enough for his physical person, he bears no distinguishable scars beyond the minor nicks here and there and calloused hands from weaponry - a testament, perhaps, to combat prowess or ample amounts of luck on the battlefield (hint: the latter is more correct than the former). His hands often ball into fists, either for wielding a blade or punching, a natural reflex brought on by decades spent around sharp, pointy objects.
Besides the occasional bout of coughing and flexing of joints, arms and legs (not to attract ladies), there are no immediate signs of the consequences of old age. His teeth, while kept as clean as possible nowadays, are clearly stained from a long period of smoking and coffee minus appropriate care.
He dresses simply, both as a civilian and soldier - a workman's wear for off-duty, and heavy furs with chain to deal with the sheer cold of Icecrown deployments. An unmarked, silver flask often hangs around his hip, sloshing with an unknown liquid. He wears a (fake) gold ring underneath his right glove, given that exposed rings tended to latch onto things and take the finger off as well when they got stuck. The only unique piece of armour he wears are plate gauntlets with spikes on the knuckles, purpose quite obvious.
His voice is as expected for an energetic, muscled and rough old man - more like a bark than anything else at best of times, and a growl when angry. Barks then turn into veritable bites when genuinely upset, which is rare considering his own experiences of the different levels that 'upset' could contain.