How many years was Norman Lloyd active in entertainment?

The exact number is somewhat uncertain, but Lloyd is considered to have one of the longest entertainment careers, nearly 100 years.

Norman Nathan Lloyd (born Perlmutter in Jersey City; 1914-2021) was an actor, producer and director) who worked in theatre, radio, film and television.

Lloyd's final film was "Trainwreck" (2015) released after he turned 100 years of age. His work in the entertainment industry began around 1923, so the answer to the question would be about 97 years.

https://en.wikipedia.org/wiki/Norman_Lloyd

Lloyd's last work was a role in the TV series "Fly", shot in 2020. So his career spanned from 1923-2020, 97 years as psnz wrote.

https://www.rogerebert.com/tributes/the-end-of-an-era-norman-lloyd-1914-2021