VW Beetle 80+ years. Royal Enfield Bullet 75+ years . HD Electra glide 72 years. BIC pen, 70 years+, Timex Marlin 60 years. Microsoft Windows 35 yrs. Honda Civic 48 years, Cub 72 years, Goldwing 45 years.
The are lots of products that stand the test of time. Most have up and down cycles, yet maintain a lot of customer loyalty.
Alright, I guess I should have suggested some parameters...
VW Beetle - designed to be an every person's car that was cheap and available to everyone.
Royal Enfield - OK, got me there. Not great bikes, but they're in a market that can't afford new tech
HD Electra Glide - It's a HD product. As noted, HD doesn't do much advancement in their product compared to any other vehicle manufacturer
BIC pens - How on earth can you make a pen function differently and update the look, for a product that costs $0.35?
Timex Marlin - Good call.
Microsoft Windows - Original version can't be compared to current one. Lada vs. Ferrari. Also has had how many updates in those 35 years?
Honda Civic - Tons of updates and body revisions etc.
Cub - Again, good call.
Goldwing - Compare 45 year old Goldwing to current. Again, they're radically different.
As for HD, they're relying on the "Heritage" moniker. They've updated some engines, but not much else. For a luxury product, I'd expect updates and embracing the future. As so many people have pointed out, their customer base is literally dying. Millenial Snowflakes don't want them or can't afford them. HD needs to pivot, or they may run into the same thing what happened to American Ironhorse - they focused on the custom chopper bike builds, when that fad died, so did the company.