The FIRST announced personal computer was the Commodore PET (1976; not shipped until later in the year).
Apple’s first computer was “Apple I” (1976). It was a completed circuit card that hobbyists bought and installed in their own cases – This was announced after and shipped before the Commodore PET. I did a lot of work with VisiCalc on an Apple II (1977) back in the day. Apple Macintosh computers were introduced in 1984. There is a famous television commercial which was “officially” aired nationally, only once, during Super Bowl XVIII (18).
Tandy made the TRS80 (1977).
Heath made the H8 (1977).
IBM started making mainframe computers in the 1952. The computing power in a modern personal computer would require a 1960s era mainframe to be in a building the size of about 4 average sized homes as a single building with dedicated – and very large – air conditioning… The power requirements for the computer were HUGE, too. And mainframes of the time had no “applications” as we know it. Use of punch cards to load the “app” and data took a LONG time to create, verify,load and process. There was no “GUI”.
The first IBM personal computer was introduced in mid-1981. DOS-only. No GUI.
So…. to answer your question directly – and assuming we’re discussing personal computers only, your aunt is mostly correct. Apple I and Apple II computers would have been available in schools (but they were expensive, so she must have gone to a very nicely funded school) between mid-1970s to mid-1980s. Same with the original Macintosh computers – see below – through the late 1980s.
The first personal computer readily available to consumers (and REALLY expensive) with a GUI was the Apple Lisa (1983). It was followed by the Macintosh (hardware and software) in 1984. I had a Macintosh, Mac Plus and Mac SE (when they became available). Upgrading their RAM was REALLY expensive. They also came with a mouse and keyboard… and a 9 inch black and white screen. When I got the SE, I also got the Apple LaserWriter. It was amazing compared to what was available on the market at the time (mostly just dot-matrix printers using pin-fed paper).
Windows 1 was released in 1985. It was horrible. It wasn’t until Windows 3 was released in 1990 that the DOS-based GUI started becoming popular.