Is extensive atherosclerotic calications throughout the non dilated abdominal aorta anything to worry about?

Calcifications. Nothing to worry about because with this knowledge now you will plan to intervene with appropriate diet and life style changes, as well as making sure your cholesterol is lowered if high. Calcifications means there was inflammation in the area and calcium deposited. This means you probably have the same in your coronary arteries. Time to take better care and get the guidance of a preventative md.
Atherosclerosis. It tells you that you have the disease atherosclerosis and need aggressive treatment of your lipids, treating also diabetes, hypertension, gout and any other modifiable risk factors you may have.