technical delays

Mick Jagger's mitral valve no longer seats
what should surge one way sloshes to and fro.
'though myocardium's not missing beats,
Jack Flash can't jump with diastole so low.
Spare parts of plastic, or recycled pork
can reset entropy's slow steady rot.
sir Mick gets top shelf care when in New York;
they'll leave no ragged edge on which to clot.
But Keith is like a fixture of the stage
what would have killed ten men just gets him high.
Las Vegas wrote him off at half this age
but neither glimmer twin seems like to die.
That one show's cancelled's not too great a loss
these Stones ain't ready yet to gather moss.