I am sure we have all had some form of similar comment, and we all have our own replies!
Well today instead of using my all singing all dancing super powerful, mega expensive Apple iMac computer to create this post, I'm using my oldest internet connected machine in the house.... at just over 20 years old, a lot has changed in the world of computing, yet in the Apple world it is also familiar, much like your Filofax of say 100 years old!
The machine is an Apple PowerMac G4 with a 350 MHz (not GHz) processor and just 896 Mb of RAM memory!! Yes it's quite slow compared to modern standards, but it works quite nicely. But I got the question from Alison 'Why are you using that old machine!'
Unlike my Filofax though I had to refer to a book to discover how to do a few things! But it's quite a special book, in the acknowledgements there is thanks to our own Nan Barber!