A lot of the first generation jets you show in this posting were updated in the liveries shown years after they were purchased. Those were not the original liveries. For example, the livery shown on the AA 707s was not the original one, neither is the Air France livery. Many airlines updated their liveries upon buying their stage II wide bodied airliners. Their fleets at the time still consisted of 707s, DC-8s, etc, and thus those aircraft were repainted too, although disposed of soon thereafter.
Frankly, I love the bare metal AA look. The new 777s and 737NGs look beautiful. It is expected that older planes will - well, look older. Planes, like the people they fly, are not youthful forever.
Atheism is Myth Understood.