High quality knifes (eg. Victorinox, Winkler):
https://winklerknives.com/Rotring metal pens and pencils: https://www.amazon.ae/gp/product/B00AZX0GOM/ref=ppx_yo_dt_b_...
High quality leather stuff like notebook sleeves, passport sleeves, knife sheats: https://ryokobags.com/products/hudson-leather-notebook-cover...
Almost any modern bike will last you a very long time. Carbon ones possibly not for a lifetime, steel ones will last for a lifetime. Get a non-electric full Ultegra set, they are awesome. (The electric is also awesome, but not sure about for-life-ness.) If you want an all-arounder, get a cyclocross bike, you can use it like a road bike and also go off-road a bit. These days I prefer Bianchi, Pinarello and Cervelo in terms of shape and color, but other brands like Trek or BMC or Cube are also great: https://bianchistore.online/road/gravel-cyclocross/
Watches. I'm not a big expert, but I don't really see a reason for a watch (expensive or affordable) to break, if you wear it reasonably. I have cheap watches from 20-30 years ago that are just fine. Obvious brands are Casio, Seiko, Tissot, Tag Heuer, Breitling, etc. (and then Rolex). There's also lots of smaller brands that make interesting watches (imo) like About Vintage, which watch experts look down on, but I think they're beautiful.
There are car types that are famous for long-term reliability. If you're thinking for life, the support you get from/for the brand matters a lot. Certain models from Land Rover, Toyota, BMW, Porsche will last very long. (I'd go Porsche, the people around it are fanatical, and Porsche proudly supports old models, look for Porsche Classic Parts Explorer.) If you want for-life, I'd probably go with an older model that's more mechanic; in Porsche world, I'd get a 997-generation 911 Turbo with manual shift for this type of consideration. The previous 996 is ugly, and the even older model has too old-school interior, but that's completely subjective (also it's rare so it's very expensive). The 997 you can pick up at reasonable used car (Porsche) prices: http://images.google.com/images?um=1&hl=en&safe=active&nfpr=...
Most/many print books will last "forever", or long enough for us to die.
Solid wood furniture; here in Dubai Crate & Barrel sells awesome stuff: https://www.crateandbarrel.me/en-ae
Klipsch speakers, like RF-3s: https://www.tnt-audio.com/casse/klipsch-rf3_e.html