OH I am so sorry to here about your bird.

But that is not normal they can live 10-12 years, I also have a canary he is into his 12 year now, and he is starting to look old now after his last moult,what colour was his poop,did it have any grit to eat as the canarys/finches need grit to grind up the seeds in their stomach unlike parrots etc who have crops and do not, without that they can sucumb to constipation and stomach problems, a canary which spends time on the floor of the cage is also not normal

Once again I am sorry for your loss.