De acordo com uma entrevista em Abutre , o efeito foi inteiramente feito em CG. Uma empresa chamada Lola VFX fez o trabalho:
As Claus puts it, the company can make anyone "older, younger, thinner [or] fatter." Lola first got into de-aging in their work for X-Men: The Last Stand, but their breakout moment came on The Curious Case of Benjamin Button, where they handled the aging and de-aging of Brad Pitt and Cate Blanchett's characters. Since then, they've had a long relationship with Marvel — Lola created skinny Chris Evans for the first Captain America film — and they were brought on fairly early in the production process to handle the de-aging work in Ant-Man's prologue.
O artigo explica ainda que a Marvel queria que o processo fosse feito inteiramente em CGI, sem maquiagem ou próteses, porque ele mexe com a maneira como a luz se reflete no rosto.