well I'm in norway
here kids start school at the end of august of the calender year they turn 6, so between 5years 8 months and 6 years 8 months. kindergarten is not compulsory but is almost universal at least from age 3.
Certainly some children start school reading and writing but it isn't the 'norm'. The national kindergarten framework explicitly states that kindergarten isn't school, so whilst there are many activities that are academically stimulating there is no expectation or monitoring of 'learning' in an academic sense.
There is a big focus on experience and development and on engaging with a childs curiosity (a least in the good kindergartens) and on things like speaking and listening.
DD1 was 'only' 5 years 8 months when she started school but I'm really glad she didn't start any earlier because although she was ready to learn academically (could read etc.) a year earlier she grew so much as a person from a year of climbing mountains, painting pictures, dissecting fish, building campfires and cooking their own meals, picking berries, doing drama, making music, going skiing etc.
Now she's been doing all thouse things (and more) since starting school too, but the balance of school is leaning towards the academic whereas the balance of kidergarten was more even. For DD she learned alot about perserverence and 'practice makes perfect' and that success is not neccessarily measured by being the 'best'. Yes, she did enjoy being 'best' in preschool activities, but she also mastered being most definitely not the fastest on skis without becoming disheartened.
I generally think kids are best placed to mature and develop those skills, and to an extent their social skills, in an environment that is not focussed on targets, grading and ultimataly ranking them. Although reception in the UK is 'play based' learning it is certainly not free of targets, grading (EYFS points) or ranking (groups, book bands etc,), and whilst these things might go over the childrens heads parents are aware and I suspect that filters down....