Elton John attends his 57th grammar school reunion

Elton John performs at the Barclays Center on December 31, 2014 in the Brooklyn borough of New York City. This was the first time he has performed in New York City on a New Year's Eve.

Andrew H. Walker/Getty Images

When Elton John says "keep in touch (K.I.T.)," he means it.

The 68-year-old music legend attended Pinner County Grammar School's Class of 1958 reunion, and couldn't have been more thrilled to see his former schoolmates.

"Lunch at home with dear old school friends," Elton Instagrammed on Sunday. "Many of whom I haven't seen for 50 years! It was as if we never left school. So much laughter and so many wonderful memories. #ShareTheLove #PinnerCountyGrammarSchool #Classof58."

The "Rocket Man" musician was especially thrilled to catch up with one pal in particular, and even posted a pic of the two of them. "My oldest pal Keith Francis. A wonderful, loyal friend for 57 years and still counting!" he wrote. "He flew all the way from Australia for our class reunion. Love you so much. #ShareTheLove #PinnerCountyGrammarSchool #Classof58."

VIDEO: Elton John falls out of a chair, gracefully recovers

Friends forever, indeed!