What a depressing thread
It gets better, it gets worse. It seems to be fairly normal to lose touch with high school friends, the same with losing touch with primary school friends. Parents are bound to get older (hopefully), just as everyone else will.
I believe there are multiple stages in life where you can get stuck and feel depressed;
- Going from primary school to high school
- Going from high school to university (or direct to a job, or to nothing for a time)
- Going your first job
- The point where you wonder why you bother doing the same work for years on end
- The point where you wonder if you'll ever buy a house, find a partner for life, have children, be able to afford children
- The midlife crisis point where you have a mortgage, dealing with a wife/husband, supporting children
- Etc.
Welcome to life, there are bad times and good times. For whatever reason you may be going through a bad time, accept it but don't let it ruin you, it tends to get better (that or you gain a much better understanding of what a bad time can really be).