Done some non-adult user stuff with .net, been thinking about doing some server side stuff with mono. Php is fine for light-weight stuff, but I've never cared for Java for some reason and C# felt good working with it. C is an overkill even for a lot of server stuff.
Check out
http://www.icsharpcode.net/OpenSource/SD/ for a free .net IDE. Fast and lightweight.
Another long time coder too. Started on mainframes with fortran in '75