If you have many similar rolls of film, which are seriously out of date: first check whether your film shows signs of deterioration, i.e speed loss and lower contrast. Run a roll through your camera, make similar shots with regular exposure, +1 stop, +2 stops, +3 stops and +4 stops overexposure, develop normally and see what you get.
If the film has been kept well, is a low speed film and not much older than 10 years, then chances are good it works as well as fresh film. If it's high speed film, has been stored in random places with high heat, or is really really old, only then would you have to think about
special measures to get useful images out of these rolls.
General rules for picking/modifying developer for these films:
- Ignore offerings of or formulas for miracle soups. A common cause for using aged film is cost cutting, and miracle soups are typically expensive.
- Don't waste effort on restoring film speed. Be prepared to shoot aged films at one or more stops (depending on original box speed and age/storage of film) below box speed.
- Do focus on restoring contrast and cutting through fog, this is essentially what David Lyga's instructions (see link above) do. Ask him, he is extremely helpful and quite experienced with this.