But Hollies drummer Bobby Elliott remembers just fine, thanks to a little notebook he always takes with him on tour.
Speaking from Manchester this week, Elliott said the last time he and the British pop group visited Dunedin was in the 1980s.
"I remember it well. I keep a diary of all my trips so I can look back. I'll have to dig it out and take a look at my last trip.
"Thinking about it, I remember buses coming from all over the place - it was a bit drizzly that day."
Fifty years is a long time in anyone's book.
It's rare for a pop group to stay together for so long.
The Hollies were formed in Manchester in 1962, and - along with the Rolling Stones and the Searchers - they are one of the few British pop groups of the early 1960s that have never officially broken up, and continue to record and perform.
What's the secret to their longevity?
Elliott said the audience's response to their music was addictive.
"We've got an extensive back catalogue of songs which has put us in good stead, and we do enjoy performing live - being on stage with the guys.
"And when you come off at the end of each show, you change your pants, get a drink, and the crowd's still going wild. It's like a drug.
"It's a massive natural high. It's very difficult to give that up.
"As long as we still keep getting the kick and the phone keeps ringing at our agent's office, we'll keep going."
Living on the road and performing for long periods of time together, it is inevitable the relationships between the band members become something akin to family.
So when a member decides to part ways with the band, as some have done over the decades, it is a huge loss, Elliott said.
"Band members become friends - very close friends.
"It's upsetting to see guys go. When [vocalist and guitarist] Graham Nash left, I was very upset."
Part of the band's longevity is down to the philosophical nature of its members.
"We always get someone new in, which gives us an opportunity to take the band in a different direction."
Despite being ranked by music critics as one of the top 50 drummers in the world, Elliott said one of the highlights of his career was witnessing, first-hand, the start and the development of the British music scene.
"In post-war Britain, it was like going from black and white to technicolour.
"It was an incredible time for music and fashion."
The Hollies were inducted into the Rock and Roll Hall of Fame in 2010 for their impact on popular music.
When I ask him how old he is, and if he still has the energy required for touring, he facetiously he says "70. That's seven-oh, not one-seven", in case there was any confusion over the telephone line running halfway around the world.
"In the early days, you didn't have much time to think about it. It was a whirlwind. It was wonderful, but crazy.
"Now we have time to savour it - we get to choose where we play and do shorter tours."
The Dunedin concert on February 1 will be part of an Australasian tour which includes performances in Auckland, Hamilton, Palmerston North and Napier.
Elliott said the band would probably perform their classic hits along with some new songs from their latest albums.
Dunedin singer-songwriter Kylie Price will be the support act for the Hollies.
