Been here 6 years now and generally speaking it is difficult to make close friends in Switzerland. I have made a handful of friends that we do stuff together occasionally but close friends I have not made the way I did in the US when I was younger. Activities and clubs with similar interests are usually one of the best ways to meet others and develope a friendship.

I think some of that depends on age, what's going on in your/their lives. At my age, most are busy with their careers and raising teenagers, so I think most don't have a lot of extra time.