> I used to mainly work in support, from 1st/2nd/3rd line to sysadmin, systems design and spec, network architect, everything. I do Windows, Linux, Mac OS, networking, comms, some programming knowledge, training, all sorts. But I'm too old to get work as a techie.
Across all the organizations where I have ever worked, I remember plenty of "old" guys doing this kind of IT stuff.
With that background, it's probably going to be hard to apply for anything different. Hundreds of applications but very low interview rate sounds like some sort of insurmountable mismatch between background and job. Or something silly in your application that is raising some sort of "red flag" for no good reason. If your age or date of birth aren't in the application, then that can't be it.