I have been riding my Koga Miyata Radonneur since 1982 and it has around 80000km on the "clock". It is an absolutely brillant bike and until 3 years ago it still many of the original parts such as the Shimano golden Arrow derailleurs (7 speed), downtube friction shifters, brakes and, levers, handlebar, Saddle and pannier.
Since I am now coming into the age where I need bigger gears i started a gradual upgrade to wards newer and 'improved' spec components such as 11 speed Deore XT, indexed shifters, flat handlebar, Miche brakes and new Campag Scirocco wheels. It is still going like a bat out of hell and I always take it for touring.
It still has the original pedals but now on carbon cranks and spider with a power meter. All in all a brilliant upgrade which gets me over the biggest hills and happily on 100mile a day rides.
unfortunately I cant yet post pictures since I am a newby but will ad them soon