Ceiling drywall separating from trim sign of bigger issues or bad installation?
I don't see anything concerning here.  Built in 2008 there has been some settling and a number of annual cycles that cause wood to shrink/swell.
I'd do nothing at my house but if this troubles you some interior caulk applied along the border would cover this up.
This all assume that the moulding is still firmly attached.  Check that it's not loosened up over time and re-fasten it if necessary.