On average a finch will live 4-8 years, some longer, some shorter depending on a variety of factors. Unlike many parrot species, you probably won't need to write your pet finches into your will. They are ideal for someone who does not want to spend the next 30 years with a pet. A finch won't care if you get married and have a new family, or move to a new home to enjoy your golden years. There are homes in which even a finch wouldn't make a good pet.
Finches do startle easily, especially in a new home, and can go into panic attacks and die.
Finches shouldn't be caged with any hookbill species because hookbills tend to bite the limbs of finches while playing, they do not do it intentionally but it happens.