I'm helping a group of people where I live to learn the basics of computers, Office, and sending/receiving e-mails. This is being done through "Age Concern".
I think you will be pleasantly surprised as to just how quick they will come to terms with using the keyboard and mouse, all the people I help are in their seventy's and eighty's.
Leave the double click a little to the left of centre for a slow response and contrary to what most will think, I have found it best to speed up the movement of the mouse to make the actual movements as short as possible.
Keep the basic introduction to the machine itself as brief as you can, the technicalities can come later. Show them the use of the internet and before introducing them to this for the first time, find some local sites of interest and save them in favourites. Theatres/Museums/health and benefits contacts, etc.
I found this was the best way to grab their attention and interest, let them send e-mails to themselves so they can see how it actually works. Take it nice and easy for the first few lessons and you won't be able to keep them away in future. Good luck, believe me, you will enjoy it. j.