As a player ages, his strikeouts will increase and his walks will decrease as pitchers are more likely to challenge him. Therefore, I believe his Ks and BBs are consistent with decline.
Also, as has been stated, players who use only a portion of the field will see a decline in their BABIP as the defense is covering the majority of the holes due to a severe pull-hitters inability to use the entire infield [see Giambi].
I believe what you are seeing from Ortiz is a repeat of Giambi, just a year or two behind. If you look at their stances and hot zones, they are basically carbon copies of each other. Lumbering, left-handed hitters with the ability to hit the ball out of the park if you make a mistake in their wheelhouse, but little else, and a halfway decent eye...and who can attribute a great part of their success due to performance enhancing drugs.