My 4 season Scarpa boots that I bought near the end of my twenties are still going strong over thirty years later. They've seen most of the significant peaks in the UK and at one point were my daily wear (for support) for a couple of months as I recovered from a badly sprained ankle. Cost a fortune back when I bought them and, like all good tools, that's proved to be an investment rather than an expense. Regular loving care with Nikwax after they've been out has helped I'm sure. Given that I don't get to get out and hit the hills really any more, and all they get called on to do is deal with snow and the occasional trip to muddier country, I suspect that they will out-live me.
Mine lasted about 25 years, and went all sorts of places like Yosemite and here[1]:
I too wore them daily, including with a suit on two occasions.
The first was to a job interview, since I had a broken 5th metatarsal and was using them as a removable cast. At the end of the day-long interview, they hadn't asked why I was wearing them, so I told them. They were amused, I got the job, and had a great time at a zany company. Zany? They published an anonymous scattergram of age-vs-salary and you didn't begrudge the outliers since they were
very competent. They also published an internal newsletter containing quotes you
really wished you hadn't made. Nobody objected; it was all good fun, being embarassing rather than malicious.
The second time was on a business trip to the US, not long after PanAm 103. I felt it worthwhile explaining to the "enhanced airport security" that my normal shoes were in my baggage, and that I really didn't want to lose my boots.
Now I've got a bunion, so my feet don't fit boots
[1] I'd never climbed nor even had a climbing lesson. Ah, youth.