Sir John Howard (Sir Sheriff of Norfolk)
Sir John was born in 1276.  He died at the age of 55 in 1331.

 Joan de Cornwall
Joan was born in 1285.  She died at the age of 56 in 1341.

 Sir John Howard (Admiral of Navy)
Sir John was born in 1310.  He died at the age of 78 on July 3rd, 1388.