I think the de-aging technology worked well in many scenes, for example the scenes with Sheeran and Skinny Razor. Skinny looked older than Sheeran, meanwhile Bobby Cannavale is nearly 30 years younger than DeNiro. A lot of this is just DeNiro's good acting and the wardrobe, Skinny wearing suits while Sheeran had a more working class attire early in the film.
"...the successful annihilation of organized crime's subculture in America would rock the 'legitimate' world's foundation, which would ultimately force fundamental social changes and redistributions of wealth and power in this country. Meyer Lansky's dream was to bond the two worlds together so that one could not survive without the other." - Dan E. Moldea
