I own a Nissan Juke 1.2 DIG-T from 2014 and lately I’ve noticed a brief rattling sound on cold start. It only lasts a second or two but it’s got me worried after reading stuff online about timing chain issues. I thought chains were meant to last forever but people say otherwise. Has anyone had timing chain problems on the Nissan Juke and is this noise something I should be concerned about?
Hope someone can help. thanks!

The main thing to worry about is oil quality, levels, and period between changes.
This all affects the internal engine parts and particularly timing chains.

Technically, they should last if treated considerately (e.g. allowing engine to warm up before driving off when cold, avoiding stop/start journeys as best as possible, not driving at high revs initially, etc).

Cars have become so reliable and long lasting since I first started driving (early 1980's) and then new cars would only last about 10 years or at least had an engine replacement in that time.
Nowadays, cars last beyond 20 years quite happily as long as they are serviced and maintained properly.
Mileages in excess of 100k is quite reasonable now but back then it was classes as high miles when it was at 50k or 60k.