Mounting a new tire.?

Inner tubes that still hold air do not have to be replaced. Don't forget that Continental has a vested interest in having you replace inner tubes when you change tires. Odds are high that you will purchase inner tubes that they make. Conflict of interest? You decide. Inner tubes can easily outlast tires. How could Continental know the last time you replaced a particular inner tube if you had a puncture while riding with your previous set of tires?

I replace my inner tubes every two to three years. Once after a ride, both tubes blew out, hours apart. I think the ports in the rim wore through the valve stems.

As opposed to tires, tubes lead a sheltered life, shielded from ozone, light and direct wear, the things that age the tires.

While its hard to say that replacing tubes regularly would be a bad idea, I've reused tubes for decades w/o any problems directly related to age.

If the inner tube is two years or more old, yes it is a good idea. tubes are cheap.

If you are replacing tires because they are worn out, the tubes will probably be old too.

If you are changing because you want a different style of tire, probably not necessary.

Must be something new from Continental. Never seen it before. Unlike tires, tubes are hidden from the sun's harmful UV rays. If the old tubes look in good shape & are less than three years old, I honestly wouldn't worry about it.

Heck...I've replaced tires on old bikes I've refurbished or fixed up with dry rotted tires & used the same old tube.

Most new tires are tubeless...