“Here’s to 80. I wouldn’t put it past him,” Kaitlin Olson wrote on social media.

As Frank in the long-running FX comedy It’s always sunny in PhiladelphiaDanny DeVito is disgusting. In real life he is sweet.

Several of his costars, including Kaitlin Olson (Frank’s daughter Dee), Rob McElhenney (co-owner of the Mac pub and co-creator of the series) and Mary Elizabeth Ellis (The Waitress) shared kind words to toast him on his 80th birthday. .

Olson, whose ABC show High potential debuted this fall and began its tribute with a nod to its hard-drinking character Frank: “Congratulations on my favorite (rum) ham.” Then she raved about the man who had played him since 2006.

“Danny DeVito is everything you want him to be. Lights up every room, makes sure everyone is taken care of, gives his whole heart to everyone and everything he loves,” Olson wrote. “Here’s to 80 more. I wouldn’t put it past him.”

McElhenney also took to Instagram to praise the Matilda actor.

“This man was born 80 years ago today,” McElhenney wrote. “He can still drink you under the table. He can still make you laugh harder than anyone you’ve ever met. He can still make you feel like you’re the only person in the room. He can make you still giving the best advice you’ve ever received and making you feel loved no matter what. He’s an American treasure. There’s only one @dannydevito Happy Birthday!!!!”

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Meanwhile, Ellis, who is married to costar Charlie Day (Charlie) in real life, had nothing but love for DeVito.

“Congratulations to one of the most generous, joyful, funny, kind, smart and sweet people I know,” Ellis wrote in her post dedicated to him. “I’m so grateful to have known and loved you (and your wonderful family) for twenty years! You have enriched my life in endless ways. Gratitude doesn’t cover everything, but it’s a great place to start. Happy Birthday, Danny! #dannydevito I love you very much.”

DeVito’s co-stars on the Emmy-nominated show include Glen Howerton, who also co-creates and plays Frank’s son Dennis.

In October, DeVito told PEOPLE a bit about working with ABC’s stars Abbott Elementary in an upcoming crossover episode.

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“We had a great time. They’re great people,” he said. “It’s such a strange mix, so it’ll be fun.”

He added, “I think we get a little wild on the show for them, but they handle us pretty well.”

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