It showed. He was as popular in the latter years as he was in the 1960s when he became a household name thanks to his stand-up routines, his tickling sticks and his Diddy Men.
Fellow Liverpudlian Claire Sweeney described Sir Ken as a "legend and an inspiration".
He said: "He was an education to watch and, afterwards, at 1.30 am, he had beers with me in the dressing room and talked showbiz".
The television personality shared some photos of the comedian's 90th birthday party on Twitter, saying: "RIP Sir Ken Dodd".
He wrote: "One night he said "I'll follow you home and I'll shout jokes through your letterbox". "Your city, friends, Family and Show business will miss you terribly".
Paul Chan, who played Mr Wu in the comedy series Benidorm, also reminisced about a chance encounter his mother had with Sir Ken decades ago. He left and sat in his Rolls Royce, parked outside, eating them.
He made a debut as a comedian in the year 1954 and since then there has been no looking back. My mum didn't know who he was.
Only Fools and Horses actor John Challis was one of the first to pay his respects, tweeting: "So sorry to hear we have lost Ken Dodd.I met him once and I've never forgotten it. Gawd bless 'im". "That's my Ken Dodd story".
Fans also paid tribute, hailing his live performances as the "funniest 5 hours of my life".