How stabile is your "biological age" stat? Is this more like blood glucose (can change dramatically in minutes) or A1C (takes weeks to move significantly) or is it even more stable than that? Said another way: In the extreme case where you had a subject that was chrono_age = 60yrs and bio_age = 70yrs and they were perfectly compliant to your recommended interventions, how fast could you get the bio_age measure down to 50yrs?