There are multiple medications prescribed for anxiety and depression. A full evaluation by a qualified professional is necessary to determine the best medication for each individual.

Most of the SSRI family is very useful, but I like mainly mirtazapine, trazodone. But again, it's case by case.

There are many medications available for elderly males who are exhibiting signs of depression & anxiety. First, the source of the complaints should be identified (dementia? Loss of spouse? Etc.). I would suggest that you see his PCP for further treatment options.