US high school finishes at 18 right, and then to college (uni) right?
UK high school finishes at 16, then to college and finish at 18, and then onto uni.
University for us is college for you! What we call college is also known as sixth form and is equivalent of junior and senior year. We just take big exams before we start it and specialise in a few subject at this point
11 - 16 [Secondary School] This is a fixed period. When you complete your 5th year you have to leave to go to college.
16 - 18+ [College] You have to start college at 16 and stay until 18 by law but occasionally some people spend an extra year if they change their course.
18 - .. [Uni] You can start uni when you're 18 but a lot of people take a break between college and uni (Gap year). Technically you could start uni when you're 78 and finish when you're 83. There's no age limit.
Move here, why?
I advocate anywhere in Scandinavia, but if you insist, go anywhere but London. I just never get the fascination with any filthy city over places like Kent, Cornwall etc.
As above, other than nomenclature regarding the word "college", in theory it's typical for UK students go to uni at the age of 18. However, students are funded by the local education authorities up until the age of 19, so some students will be slightly older depending on their route through further education. For example, it's very common for students applying to creative arts degrees to do an "art foundation" which is a yearlong course taken after the completion of their secondary education.
Furthermore, taking a "gap year" after finishing secondary school, before starting university, is quite common - while usually students will have already applied and hold an acceptance to the university of their choice, and will have deferred entry for a year to engage in other activities, some students will decide later to do so and will apply to university in this gap year.
It's also not uncommon for students applying to Oxford and Cambridge (you can only apply to one in any given application cycle) who fail to get a place the first time to try and reapply during a gap year (usually at a different college at the same one, although sometimes they will switch their application to the other if both offer the course). In a similar vein, some students find they do much better than expected, and while there is a process to allow them to "trade up" to an extent in the same application cycle, they may decide to take a gap year to apply to "higher ranked" universities.
Additionally, "mature students" applying to universities is a lot more common in the UK than in the US, who are defined as students over the age of 21.