In the Disney canon there are many Force users, though fewer than Legends to be sure. How many of these characters could imaginably still be alive by the time of The Force Awakens?
Luke Skywalker is the only one that comes to mind.
As for the Disney canon, there are no other force users really mentioned in the original trilogy, alive or dead. Most of the current Disney canon revolving around force users is either pre-order 66 (Clone wars), or before episode IV (Rebels).
But from Rebels we have Asoka, Ezra and Kanan.