Complications from Bellafill, short term or long term are actually very uncommon as are the complications form short term fillers like Juvederm.
The complication rate for problems with Bellafill year over year has been 0. 011% while the complication rate from the hyaluronic acid fillers has been 0.012%.  These are figures that are produced from the FDA based on the reported adverse events from the product as compared to the number of syringes sold per year.  This is not the best way to study complications but it is all FDA has to go on after a product has been approved and launched.
Interestingly, since Bellafill is a long term product, one would think that the rate would be increasing year over year but it is actually decreasing year over year.
Bellafill is my “go to filler” for just about everywhere in the face and I have been using it for over 10 years and find it.  You should be very happy with a Bellafill filler treatment, especially in your nasolabial folds.  Most woman who get their temples at your age are underwhelmed with the results and I have abandoned injecting that area as a result.