I also totally agree with the previous comments! So after I just registered, I have to comment too :-)
In general, I think people have the tendency wanting to control their lives as much as possible. Now, while people are living in their "running system", where everything works, where they have their daily lives and where they just know what's good and bad, they automatically have a certain secureness of how future is going to be. This is due to the fact that life in this case is more or less a routine.
However, when people face changes, live goes beyond their routine and future becomes not as predictable anymore. In the urge of wanting to maximize control, which automatically leads to a high certainty of knowing what is going to be in the future, people often avoid changes in order not to leave the path of their structured life.
The fear that something becomes bad in the future that's good in the present (or even just "ok") is too large for people who don't face changes. For example, a person who is fairly satisfied with his job he is been doing for many years might not quit or get a new job because he/she might be afraid that any kind of new job might turn out to be failure after a few month. So they stay.
Nevertheless, people OFTEN forget that something that is good (or "ok") can even become better - can become VERY VERY GOOD. So people who don't face changes automatically loose the opporturnity to improve life.
In the end, while others (neighbours, friends, family members) move on and they keep getting stuck in their own "secure avoiding change world", they will eventually get the feeling of getting passed or even of moving backwards.
Change is nessecary to keep the pace of life, to keep improving life and while doing this, hopefully being a role modell for others to follow and enjoy life as its maximum too.