My Win7 box on 5400 rpm rust has never been internet connected, no updates, Office 2000 from a CD, various other maths based s/w. Starts and shuts down in under 10 seconds each. Why would I want to update it? It boots faster that the M.2 SSD Win10 box mentioned below.
Alas the paired 20 year old HP printer has finally bitten the dust, and I await to see if the new HP printer plays ball.
Alternatively, the Win10 box has auto updates and just this week got a KB that purported to stop Specter Variant 2 (worryingly that was microcode from intel too). It took two attempts to install, the first to a black screen of doom, the second reducing the game frame rate to 2 fpm (yes, minute is intentional). That got rolled back pretty sharpish on the grounds that someone crafting an SV2 exploit on it is unlikely and a lower impact than essentially bricking the PC for its intended use.