"Discovered" by Steven Spielberg at the Bar Mitzvah of a friend of Spielberg's daughter.
In 2009, he co-founded the theater/film company The Collectin with Zoë Worth.
Alden's ancestry is seven eighths Ashkenazi Jewish and one eighth British Isles (the latter from a paternal great-grandmother). His Ashkenazi ancestors came to the U.S. from Russia, Austria, Bohemia, Hungary, and Poland. Alden was raised in Reconstructionist Judaism, and had a Bar Mitzvah ceremony.
Auditioned for Peter Parker/Spider-Man in The Amazing Spider-Man (2012) and Harry Osborn in The Amazing Spider-Man 2 (2014).
Last name is pronounced "air-ren-rike", and means "rich in honour" in German.