I am 66 now and retired.
Without computers for the first 26 years of my life except for a slide rule and a coffee mill Facit.
Not much of a ZX81 fan, Bought one with a Chess game , Never finished any game on it. After the troublesome loading from tape I usually fell asleep at the 3rd move (the ZX81 was too slow for words)
Since 1970m I was working on a range Mainframes and HP PC's (a HP9845 -from about 1977 as a shared PC)
In about 1979/80 I bought my own PC - the fabulous HP85 - (16K additional memory and a full house of 8K ROM's including assembler)
With the HP85 I could suddenly do things which I could not succeed in work time. (Even almost divorced)
Irrigation design (have a look at www.gwis,co,za for the current version)
Beam design etc etc
Big data base
Upgraded to HP86b (96K memory)
With this I had a big GIS Water use data base running