What do you know about high alkaline phosphatase levels?

Plenty. You describe yourself as a 73 year old lady and i'm betting you feel well but have an alk phos a bit high on your routine chemical profile. Many folks, depending on blood type, shoot the alk phos up after eating. Maybe 5% of folks your age have a high alk phos because of subclinical paget's disease which we aren't going to treat or worry about. "treat the person, not the labs.".