Helicopter pilot reported a near miss while preparing for takeoff as the other aircraft took off behind the reporter's aircraft without making any radio calls.

Narrative

I was a student pilot preparing for my private helicopter rating at ZZZ airport; when this incident occurred. While at the south end of Runway XX at ZZZ; my instructor and I were preparing to engage in a maximum performance takeoff. While clearing the area for traffic; I looked on ForeFlight and saw that an aircraft was coming down the runway from behind us. I looked over my left shoulder and saw the airplane taking off from behind us on the same runway without yielding the right of way and without making a radio call on the CTAF. When airborne; the airplane went to its left and our left to go around us; then turned right over and in front of us before we began our maneuver. The pilot of Aircraft Y never announced or responded on the CTAF and proceeded on to ZZZ1 from ZZZ.My instructor spoke with a board member of the association who then spoke with the pilot. I was not a party to either conversation; but it was reported back that the pilot of Aircraft Y made a comment about his age and that it may have played a part in him not seeing us.