Thinking 'back in the day' I kept in touch with all my friends from 6th form for about 6 months. By the time first summer came around, I was only half bothered about seeing most of them. Generally the meeting points would be friends birthdays which fell in Christmas or Easter holidays. By the second summer of university, I was down to possibly half a dozen people I actively contacted or lived by. Roll on another two years and I might have seen one or two people randomly when out and about.
Many of my friends from 6th form either didn't go to uni, or went to the local uni. Whenever I came back from uni further afield (5 hours away by car, 5.5 by train, thank you public transport!) my 6th form friends were still in the same social groups, hardly bothering to meet new people, still going to the same pubs and clubs. Though they were 3 or 4 years older, it seemed like most had never moved on, and I felt it was somewhat sad in that respect. Being so far away from home had also changed me, I've no doubt about that, I didn't see the 'lad's mentality' as a pivitol thing anymore and so nights out weren't the same back home.
Perhaps it was inevitable, but by 4 years out of school, I bearly saw anyone, and now I see perhaps one person a year, again pretty much by complete fluke or my parents saying "I heard your old friend Lloyd is now doing.....".
Thinking back to 6th form I remember thinking 'How will we all ever grow apart', now I think 'How could we have ever not?'