Not all - ones who in the end die in their sleep in Peace / but a lot suffer till then - some don't ever feel more than normal life pain and just die - it all just depends on person - life lived - their health and when and how they die and in the fashion they die - we all couldn't hope to die in peace in our bed at home --
The death of all people is not painful. People who are truthful, honest , sincere, devoted and who are very helpful for the welfare of mankind can deserve painless death. On the other hand those who are dishonest, unfair, terrorist, liar, killer and always try to do something bad to other people deserve painful death.
No some its real peaceful . It is perfectly natural almost comforting. The things of this world become less important and the acceptance of death can be quite peaceful. If its not something like be crushed or some disastrous way.