De or het kennisveroudering?

The correct Dutch article is:

de kennisveroudering

Rule Words ending in -ing: almost always de. See the rule

How to use kennisveroudering

the kennisverouderingde kennisveroudering
this kennisverouderingdeze kennisveroudering
that kennisverouderingdie kennisveroudering
our kennisverouderingonze kennisveroudering
your kennisverouderingjouw kennisveroudering
every kennisverouderingelke kennisveroudering
which kennisveroudering?welke kennisveroudering?
a big kennisveroudering / the big kennisverouderingeen grote kennisveroudering, de grote kennisveroudering