I lost my last permanent job in London at the end of 2008, at the beginning of the financial crisis in the UK. I applied for about two thousand roles in 2009 alone, and from 2008-2013, about 3,500 roles in total... In about 6-8 countries in multiple disciplines. I averaged 30+ applications _per day_ at first... and 1 interview per year. From 2009 to 2013 I got 2 months of paying work in total. Reason? I think it's be…
> 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.