[Profpat]

As for the twins, Pat, the real question, in my mind, lies not in why or how their bodies age, which should be governed by mechanical time/motion, being as they too are massive objects, but how do they percieve this aging within the two relative aging frames, which is relative to how we define consciousness/awareness. Would ones awarness accelerate/decellerate also, whereby he didn't percieve a change in the acceleration/decelleration of his aging, or is awarness at a constant velocity, whereby any change of aging would be recognised?

Hi analog;

I think David is correct. My heart beats at 60 beats per minute and would do so whether here on Earth or going close to light speed in space.

It's just the clock, and therefore my heart beat, is going a lot slower relative to Earth time.

Best to you,

Pat