If you are 68 with a cac score of 0 that means your risk of a coronary event is very low despite your high LPa. Statins do nothing to lower LPa and a few studies showed that it might even increase it. Niacin ( vit B3) has been shown to lower it about 15-20% . There are some new drugs nearing approval that can lower it 80% or so.
But really with your cac score I would find something else to worry about although I would do a repeat test in a few years to see if it has increased and take action then if the increase is significant.