Quick AI search suggests average car age in Norway to be 11.1-11.3 years, so indeed quite similar.

As for what would happen with gas station when EV's dominate, what already seems to be in progress here (not due to EV's, but other factors in the market) is that the "traditional" gas station serving stale coffee, snacks, and windshield wiper fluid are on the way out, replaced by either unmanned cold stations with just the pumps, or then by major roads large full-featured mini shopping malls with groceries, half-decent restaurant (sometimes several), and other shops. I think in a future EV world the cold stations would disappear but the higher end service centers would do fine.