1995 Oldsmobile Ciera No real problem yet but have question

I just purchased a 1995 Olds Cierra w/28,000 actual miles. The car was owned by an elderly person that passed away, however, the car was in a garage for years.

I'm concerned about the belts having dry rot and that they should be replaced. Also, does the car have a timing belt or a timing chain and should I replace that?

The car runs and rides beautifully, no problems but I don't know what I should update due to the circumstances of the car sitting for a while.