Things like bread etc can be eaten 1-2 days after the best before date and even if it has mould on a few specs.
Despite the above im healthy, not obese like the majority of people . Perhaps it is because im under 50.
I wouldnt advise a 80 year old to eat out of date food due to reduced immune system.
any cooked items should be frozen if not going to be consumed within 1-3 days. i wouldnt trust a bolognese thats been sat in the fridge for a week .