He was 88.
Since 1958 he taught at the Jacobs School of Music at Indiana University.
He was, simply put, one of the greatest cellists to ever live.
I offer that evaluation as one who was himself as an adolescent a very serious cellist and as one who had the opportunity to play in an orchestra behind him.
perhaps this will give you a sense of his mastery:
He was, according to friends who studied at Indiana, an absolutely superb teacher, as you can see here:
Here are some notices about his death:
Just posted in memorium:
this video bio
and finally, an excerpt from the Kodaly Sonata, which is incredibly difficult for ordinary people:
rest in peace, Maestro Starker!
UPDATEThe Jacobs School of Music at IU has set up this tribute page which if you explore you will gain a sense of his great influence.