Robert De Niro, 80, found himself on the receiving end of one of Oscars host Jimmy Kimmel’s jokes during his opening monologue on Sunday. While Kimmel came under fire for ridiculing Robert Downey Jr over his past drug use, his jibes towards De Niro were met with a much warmer reception. The late-night talk show host couldn’t resist teasing De Niro about the age gap he shared with 45-year-old girlfriend Tiffany Chen. The pair have been romantically linked since August 2021 and even welcomed a baby daughter named Gia Virginia back in April 2023. Kimmel’s monologue involved paying mention to the …