The reason I raise this is to give others hope. Even without knowing too much a lot can be done and we are never too old to learn new tricks. There are far too many things to know about to be experts in everything and the best we mortals can do is try our best in a limited area. This is why I concentrate on simple HF and low VHF QRP projects, optical and VLF work which I can get my head around. I'll leave the complex stuff to people far better than me.