Jonathan,
To further clarify; If you have two objects of equal density, one has significantly greater velocity and the measure of duration is penetration, then it would constitute two clocks with unequal stores of energy, kinetic in this case, while frequency declines over the course of penetration. So yes, the one with greater velocity would "live" longer.
As for Tom's response, that was to a comment I made to Peter, explicitly changing the topic from quantum effects, to basic mechanical ones, in order to simplify the argument that time is a measure and effect of change, not some underlaying dimension for it.
As I keep arguing, by reducing time to measures of duration, physics simply codifies our perception of time as a vector from past to future events, since as individual points of perception, we experience it as a sequence of events, rather than the actual cause, which is this process of change forming and dissolving these events, thus it being they which go from future/potential, to actual/present, to past/residual. Keep in mind that potential necessarily precedes actual.
Duration doesn't transcend the present, but is the state of the present between and during the occurrence of events.
Tomorrow becomes yesterday due to change, not traveling the flow of time from yesterday to tomorrow.
Regards,
John M