Age is but a number, yet these stars over the age of 90 have a lot to celebrate.

From James Earl Jones and Clint Eastwood to Iris Apfel and Rita Moreno, these A-listers have storied careers that have spanned for decades and some of them are still at it.

Here’s a list of celebrities who have turned 90 and how they used to look in their younger years.

Bob Newhart

Born Sep. 5, 1929

Bob Newhart, seen here in 1961 and 2019, thinks laughter helps people live longer.

Bob Newhart celebrated his 90th 𝐛𝐢𝐫𝐭𝐡day in 2019 and he chalks up his longevity to laughter.

“I think laughter is vital. It’s as vital as breathing. It gets you through difficult areas,” he told The Day that year. “Laughter is one of the most beautiful sounds in the world. It’s like music, of a kind.”

Known for his deadpan and stammering delivery style, he got his start as a stand-up comedian until he transitioned to his famed TV career with hits including “The Bob Newhart Show” and “Newhart.”

He also notably played the beloved bellhop in the 2003 movie “Legally Blonde 2: Red, White and Blonde,” and the Papa Elf in the 2004 Christmas comedy “Elf.”

Gene Hackman

Born Jan. 30, 1930

Gene Hackman, seen here in 1971 and 1991, retired from acting in 2004.

Gene Hackman hit the 90-year mark in 2020 but he retired from his acting career back in 2004.

The reclusive star gave his first interview in a decade to The Post back in 2021 to reflect on the 50th anniversary of “The French Connection.”

“Filmmaking has always been risky — both physically and emotionally — but I do choose to consider that film a moment in a checkered career of hits and misses,” he admitted in the exclusive 2021 interview.

He is also famous for starring in other big movies including 2001’s “The Royal Tenenbaums” and 1992’s “Unforgiven.”

Hackman won two Academy Awards for his roles in “Unforgiven” and “The French Connection.”

The movie star hasn’t been spotted out and about much in his later years, though he was seen looking in tip-top shape as he did some yard work in March 2023.

Harry Belafonte

Born March 1, 1927

Harry Belafonte, seen here in 1956 and 2021, was honored for his activism on his 95th 𝐛𝐢𝐫𝐭𝐡day.

Harry Belafonte rose to fame as a singer but over the years he has used his platform to fight for racial justice.

Belafonte was honored for his activism at a star-studded gala celebrating his 95th 𝐛𝐢𝐫𝐭𝐡day in 2022, though he could not attend due to travel concerns amid the pandemic.

However, Spike Lee, Michael Moore, Whoopi Goldberg, Alicia Keys, Al Sharpton and Danny Glover were all there to celebrate, according to the New York Times.

The Caribbean-American singer is known for popularizing the calypso musical style and is known for songs like “Day-O,” “Jump in the Line” and “Jamaica Farewell.”

Joel Grey

Born April 11, 1932

Joel Grey, seen here in 1964 and 2022, made his stage debut at the age of 9.

It’s curtains for his younger years.

Joel Grey celebrated his 90th 𝐛𝐢𝐫𝐭𝐡day surrounded by some of Broadway’s best in a 2022 Times Square celebration.

The theater star kicked off his milestone 𝐛𝐢𝐫𝐭𝐡day with Bebe Neuwirth, Donna Murphy,  Bernadette Peters and more, according to Broadway World.

“If you are a young person who dreams of being a part of Broadway, come to New York. We want your talent. If you’re a fan, buy a ticket, see a show. We want your passion and your energy,” Grey told the website during the festivities. “Broadway is back and better than ever!”

Grey, who famously played the Emcee in “Cabaret,” is only one of eight performers in history to have received a Tony and Academy Award for the same role.

He made his stage debut at the age of 9 and has since starred in “Chicago,” “Wicked,” “Anything Goes” and more.

Norman Lear

Born July 27, 1922

Norman Lear, seen here in 1972 and 2021, celebrated his 100th 𝐛𝐢𝐫𝐭𝐡day at his “Yiddish Hyannis Port” in Vermont.

Norman Lear celebrated his 100th 𝐛𝐢𝐫𝐭𝐡day on his farm in Vermont with his wife, his kids, and his grandkids.

“I think of it as a Yiddish Hyannis Port ’cause as a kid, I so admired the Kennedys as a family having a place to get together to enjoy one another, he told E! News in 2022, adding that his 𝐛𝐢𝐫𝐭𝐡day party was “heaven.”

Lear has produced, written, created, or developed over 100 shows including the iconic sitcoms “All In The Family,” “Maude,” “The Jeffersons,” “Sanford and Son,” “One Day at a Time,” “The Facts of Life” and more.

The five-time Emmy winner’s career was honored in an ABC special, “Norman Lear: 100 Years of Music and Laughter,” featuring stars like George Clooney, Tom Hanks, Jennifer Aniston, Jimmy Kimmel, Amy Poehler, Octavia Spencer, Tracee Ellis Ross and Kelly Rowland.

Robert Wagner