I was 7 or 8, it was a Sharp machine that had a tape (as in cassette) drive and no screen (they were expensive). Using the manual, we used to boot up the machine from the tape, type commands on the keyboard in something like BASIC, and get a roll printer to print out-into two colors, black and red!- a car.
The second machine I got was an IBM XT clone, with DOS 2 or 3 and green CRT twice as deep as the desk we had it on.
Ditto, the family bought Sharp MZ-700 when I was 7 (c.1985), and only I became interested in it.
I upgraded to a Commodore 64 in about 1988, after my aunt didn't want it, and then a disk drive 2 years later with freezer cartridge. I had a lot of fun. The 16-bit machines (I had an Amiga/Atari ST) were fun, but it took until I got a 486 PC with 16mb RAM (1996) to actually make good use of a computer. Mainly web design work and email.
The second machine I got was an IBM XT clone, with DOS 2 or 3 and green CRT twice as deep as the desk we had it on.