Along with ZM I'd recommend a Mac… our main computer is a MacMini… had it 3 years and nary a problem (be sure to immediately, upon notification, download and install any updates)… just requires a few clicks, et voila done and computer protected against intrusions of any sort. Mrs. C. received a MacBook Pro tablet for Christmas… amazing machine, but it does operate entirely on WiFi, so consider that…
We also both have Apple iPhone 6 phones that we can use to check anything on either computer when we are away… age shouldn't be a limiting factor in estimation...