Jordan Marotta, 5, of Dix Hills, L.I., became the youngest-ever recipient on Wednesday of a top-of-the-line bionic arm, decked out — at the youngster's request — in 'Iron Man' red and gold.

The 3D-printed bionic arm was designed by Albert Manero, senior director of an organisation called Limbitless Solutions, who accompanied the Iron Man actor as he delivered the bionic arm to seven ...