I know tons of people here in Germany who have had their cars officially running with their parents' insurance well into their late 20s (basically as long as possible because it was simply like half the price), at least until some years ago.

We also have this health insurance thing where you can be insured with your parents up until 25 I guess, if you're still going to school or university.

Maybe your point is "people should stand on their own feet at some point" and maybe I'm not weighing 20s vs 30s enough.. but to me that simply sounds like saving money. Hell, if I had had my parents living close to me in my late 20s and being able to save money just by having some contracts in common, I would've done it.

If you have a car on your parents insurance, you are not building up your "damage free years". So it's better to just pay for the high insurance at a young age so you will enjoy low insurance later on in life. At 26 I was already at the maximum of 80% discount on my car and motorcycle insurance.

It's cheaper for my younger brother to be on my parents insurance until he's ~25, and _then_ start building a no claims bonus than it is to start building the NCB now. Paying €1200/year for 4 years and then taking out his own policy starting from fresh is cheaper than paying €3000+ for his own policy and it gradually decreasing over the next 4 years.

I guess it depends on the country and insurer. I insured my moped by myself at the age of 16. Paid €150 per year which was a lot of money for me. When I bought my first car at the age of 22 I only had to pay €300 per year for liability because my no-claims bonus was almost at the maximum amount.

Yeah it absolutely depends, I've seen a lot of calculation models so please don't take anything I wrote above as advice, was just trying to show a different side.

FWIW, for me it was: car insured with parents until I was like 23 I think, and those first 4-5 years were cheaper by A LOT. And then I could still claim my "no accident/damages in 5 years" fee reduction, although maybe not as much as I could've gotten. But money was a bit tight, so it wasn't really a question of "will this save me something in 10 years" more like "I prefer to have a car (first own, cheap one)" over "nope, no car".

It depends on the country I suppose. In Denmark most insurance companies offer "elite" status as long as you're 30 with no prior accidents to your name.

I know lots of people who do this - but in most cases it’s about frugality - for a family of four with two grown children paying ~$100/month (4pp family plan) vs. $220/month (2pp family plan, and two individual plans) it just makes sense

To be honest, I share my Netflix account with my parents. Saves me a bit of money.