True about the fëa; however a mortal wearing a Ring does not continue to age in the normal way. Bilbo didn't, and Gollum didn't. They were, as you say, 'thin' and 'stretched', but their lives did continue and they endured. The Ring in this case was perhaps retaining and preserving the wearer from ageing, while, as you say, the continued burning of the spirit wears it down.
What I am saying is that the body of a Ring-wearer didn't age as such, in terms of the ageing usually sustained in the process of getting old, but that the unnatural prolongment of it sort of tired and depressed both the spirit and the body -- as you have said, the fëa probably drains it of its vitality. Eventually, of course, a wraith-like state is reached, but even then the body is still active and not yet 'consumed' as you suggest. A wraith seems to be a being that has come to be utterly devoted and attached to Sauron's power, irretrievably invisible, rather than one who has lost the power in his body and become a mere shade because of it. The Ringwraiths did have bodies, and apparently quite serviable ones (presumably filled with the projected essence of Sauron); Merry's sword certainly pierced 'undead flesh' when he stabbed the Witch King on the Pellenor. The Nine Rings were probably just as effective, perhaps more, as the One in effecting an 'invisible', life-prolonged and dominated state, as that is what they were designed for -- the One containing more power, it was actually in origin designed as a tool of power for Sauron's personal use, rather than to make a connection with someone else as a channel through which Sauron could feed power.
The effect of the One may also have been worse to the body than that of the Nine. As I said, the Rings seem to in effect preserve the body from ageing, but keep it in contact with the damaging fëa; but the One may have had a worse effect in that it had a burning power of its own. The burning of the fëa may have been combined with the sheer power of the One, to produce a rather nasty 'double' effect on the bearer.
This may explain why as those in servitude to the Nine were strengthened by them, the owner of the One appears to be weakened and bowed down by it -- although toughened and preserved in the bodily sense, the spirit at least was 'thinned'. Just a theory, anyway.
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