What is a term for "modern" technology that doesn't imply up-to-date?

Solution 1:

This is a good chance for you to invent a future present adjective for a society which will inevitably exist on the futuristic socio-economic scale, I predict. Done cleverly, without any doubt the descriptive term will be plagiarized. I’d advise to think in terms of future “vintage” or future “primitive” - or, i.e., what design now seems extremely technologically advanced to even the most classified of governmental technology project managers will, at some point in the future, have lost its usefulness, but not its ability to perform the original task. To the classified military project manager of the future it is nothing but scrap. But to a future society with few resources, it can be a life sustaining blessing. In what terms would you describe such a society ??

Solution 2:

There may be several ways to go here:

Post-nuclear but pre-fusion.

Subsequent to the development or use of nuclear weaponry; specifically of or belonging to the period after a nuclear war.

pre-fusion needs to be broken down to pre- prefix:

a prefix occurring originally in loanwords from Latin, where it meant “before” (preclude; prevent); applied freely as a prefix, with the meanings “prior to,” “in advance of,” “early,” “beforehand,” “before,” “in front of,” and with other figurative meanings (preschool; prewar; prepay; preoral; prefrontal).

and fusion - suffix:

Also called nuclear fusion. Physics. a thermonuclear reaction in which nuclei of light atoms join to form nuclei of heavier atoms, as the combination of deuterium atoms to form helium atoms.Compare fission(def 2).

Since there is no conditional probability that your world will enter a "post-truth" era, I'll dismiss this possibility.

Parochial space-faring society:

very limited or narrow in scope or outlook; provincial

I'll introduce a further possibility.

A "nearly planet-bound" society or culture.

The meaning being explicit with regards the culture or species being almost entirely on one planet, the implication being that no colonies have been established elsewhere in great number.

Solution 3:

I like "the silicon age" commented but different planets might develop the same abilities by using different discoveries / inventions / technologies. For example the computer was invented before the age of silicon, which was the facilitator. So is it the technology or the ability which is important?

I think the latter, so I propose

The age of spaceflight.

or

Planet X has reached the space age.

which says what can be done but not how.