With my 72 year old dad I mostly notice tech related things. He's a smart guy, worked in banking and finance his whole career (so used computers pretty heavily)

With my 72 year old dad I mostly notice tech related things. He's a smart guy, worked in banking and finance his whole career (so used computers pretty heavily) and was really into PCs in the 90s. He was constantly setting up and tinkering with DOS, Windows 3.1, 95, etc. as well as learning to program. These days he is limited to the basics on his PC: email in outlook, checkbook in Quicken, basic web browsing... and he often runs into trouble with them. I'm on TeamViewer about once a month helping with something. He also has an iPhone and iPad but can just barely do the basics on them, watching him try to use them is just painful. Some of that is due to crappy modern UX, especially on the iDevices, but his ability solve tech problems and deal with unexpected situations has dropped off a cliff the last few years. Age is coming for us all...