My car has another 3 months to go until it is 6 years old.
In the first year I needed a firmware update to fix freezes on NavPro, and there was a wobble at the first MOT when it failed due to a leaking High Pressure Fuel pump and a split gaiter on a driveshaft - both fixed under warranty.
I now annually lubricate the pano roof to prevent noises when it is closed...and that is it.
Although it is now very much a "fun/long drives only" car and is mainly garaged with 20k miles since new, this has been basically trouble free operation - what a car!
I did go electric last year when I bought a Nissan LEAF 40. No contest with the Golf for build quality, but I love the concept of electric drivetrains and have a VW ID.3 "booking" for one of the first 1500 cars in the UK so expect to replace the LEAF next year, although I have no plans to sell the Golf!