Yes much more than that.. Emailing will be basic. This person is quite good with Word, Excel, Online trading etc. His interest is more on the Hardware, Networking etc which he could take up as occupation after he retires from his regular job
Hardware and networking!!?? That's impressive for an old man. If you got the time, teach him the basics and try to keep the fees nominal. He learns, you get paid(consider it as your pocket money). Both are happy!