I've had a number of bikes over the years. The first serious bike was a Holdsworth Cyclone, 1966 model bought new at the end of 1967. That one toured, did TTs, provided my student transport (including around 30 return trips from Bristol to London when I went home for weekends!) and did a year of 35mile return commuting trips into central London. Then it was stolen
in 1974, complete with the 1/2 ton concrete base and iron bar it was chained to. According to the cyclometer I'd had on it from new it did just over 80,000 miles in its 7 years. 3 sets of wheels, lost count of how many transmissions, 3 sets of BB bearings, and a complete refurb of the headset - and still the original Campy gears.
Next serious one was a Peugeot. Similar idea, a bike which stripped down would go fast, but would equally well take panniers etc. and go touring. It did just about everything, but I did less miles each year, and it lasted me from 1974 until 1996. Then I was forced into the side of the road, and the frame broke. It had rusted through in two places, a chain stay and the one which broke in the crash, the left prong of the forks. I hadn't inspected closely enough, and the paint had stayed more or less unaffected so I hadn't spotted it. I lived and worked close to the sea for 8 years while I had that bike and suspect the corrosion was partly caused by parking the bike outdoors there. That bike did about the same mileage as the Holdsworth, just took 3 times as long to do it.
While I had the Pug I also bought an early mountain bike, no suspension, and with slick tyres and a rack (much to the disgust of the sales assistant at the LBS). That was a good commuter and shopping bike, but sadly got stolen
from outside a supermarket. The generosity of the thief was astounding - I was left with the lock and the cable in 2 pieces!
After that I ended up using the children's cast offs, and partly as a result did less cycling, until a few years ago when I was bought a Ridgeback mtb as a present. It fitted me, kept its knobblies for 3 days, was rackless for a week, and it took another week to get some cheap panniers! That done it's the best round town bike I've ever had. It was joined a few months later by the Dawes Horizon, the first bike I've ever bought second hand, very comfortable, and excellent for day rides and getting out into the countryside round here.