These guys are touring together right now. They were in Jersey this weekend. Anyway, Frankie Avalon is the oldest of the three. He's 74, and Rydell and Fabian are both 72. But I think Avalon looks the youngest of the three. But he always looked good for his age. He was already about 40 when he appeared in "Grease," and he looked much younger even then.
Speaking of Frankie Avalon...
He introduced me to someone who became my Wife.
Short Story and certain details will be left out.
Back in about November/December 1980 - I had a mutual friend that my wife and I knew who was Showing Frankie Avalon around Town in Ohio. I was Bodyguard to Frankie Avalon and his Manager a particular evening. Frankie had finished up a Show and we went to another Club. My Wife was working for our mutual friend's regular Job that night. When my Wife came to the Club to turn over the keys to our mutual friend. BTW my Wife knew Frankie before that event. Frankie Introduced me to my Wife and since I already knew the Mutual Friend no introductions were necessary. Short time later we were married.
Frankie Avalon is a great Guy and I have great respect for him.