When you lose someone you love, even if they are very old, and have been very ill, and their death was expected, and you think you're prepared for it - you aren't!
Exactly this! Tbh, I think the narrative that just because the death was anticipated to some degree and because you are old and perhaps frail in some way, your grief isn't as acute as it would be if you were younger, is not only ageist, but insensitive and unimaginative in the extreme.
And it doesn't matter how many people are around you - or not - you still long for the individual that has died.
It's also quite impertinent (I think anyway) to speculate whether someone is "relieved" or not when someone dies. There may be an element of relief that they are no longer suffering, but that is mixed with a very strong and (probably somewhat selfish) wish to see them again, hold their hand, and just for them to be there again, that can be overwhelming at times.