Peter was born in August 2001 and died in The Avengers 3 on April 2018, approximately at age 16 years and 8 months. In The Avengers 4 apparently everybody was revived on October 2023 with the same age they were when they died. Being 16 years and 8 months old on October 2023 makes you born on February 2007. This also means Peter was 17 years and 10 months old by the end of Spider-Man No Way Home on December 2024