It's not "dead" or "on the shelf".
Age 67 is included in the HR, and is not included in the SR. Those two bills MUST be 100% reconciled down to the last T crossed before the FAA re-authorization can be sent to the WH for signature.
Next step will be conference committee, where hand-picked reps from both house and senate hash out a synchronized version of the two bills, which is palatable to leadership of both houses. That will happen behind closed doors, and we (the public) will have zero insight into the process until the results are returned to both houses for consent ratification (which is normally pro forma).
You can speculate as to how conference might go down, based on the political manuevers that have been publicly observed to date. But you can't know for sure.
Conference doesn't seem imminent at this point, they may be busy with other issues.