Does age matter when buying an Xbox one?
Yes, under 18 already. A parent must sign with the purchase or a person who is of legal age.
I bought my Xbox 360 at the age of 13 at Gamestop and did not need any parents
And why? If there's no bundle with his name is from 18, it does not matter?
No, because that's not consoles for kids. Is even small in the packaging and in the description.
So I would not buy an old model or used and old. Save a little longer and buy the latest model.
Completely wrong. The XBox is both a console for kids like the PS and Switch too. There's no age rating for them. There are also a lot of games, which are released 3 years. The console itself has no rating.
The problem is rather the age which one needs in order to be able to conclude a purchase contract at all.
I'm talking about the purchase contract. Nevertheless, the age is on the box. The account or games that are for example for children is even "only with the company of an adult", if you have read through the small and / or guidelines.