Hypersmurf said:
Timeless Body doesn't need to make you young again if you're still young when you reach that level.
Reincarnate makes your body young again; Timeless Body can make it so your body never stops being young in the first place.
Via Timeless Body, you can die of old age when your body is still that of a young adult. Reincarnate doesn't make your spirit young again - you retain your memories, etc. If you'd gained increases to mental abilities through aging before being reincarnated, you would retain those increases in your new body.
So why should Reincarnate's 'old creature in a young body' behave differently to Timeless Body's 'old creature in a young body'?
-Hyp.
I think the basic arguement is that Timeless Body and it's ilk clearly spell out what happens; You stop taking aging penalties (note, the monk/druid version, at least, does NOT say you remain physically young, just that you can't be magically aged and don't take aging penalties), but you still drop dead at your maximum age. Reincarenate does not refer to Timeless body or it's ilk - it just says it puts you in a young adult body. No mention of how much longer you have. No clear mention of what this means to aging bonuses. It's not clear in the RAW.
I suspect those who see Reincarenate as a viable method of immortality look at "
young adult body" and think: Hey, I've gone from being a 355 year Venerable elf to a 50 year old Dwarf; cool! I've got another 200 years before I hit the Venerable category again! I can do this later, too, to be young yet again!" - it's a young adult body, and most the age-related troubles that kill people in real life are due to body breakdown. It makes perfect sense that switching to a young adult body every now and again makes for effective agelessness.
I suspect those who see Reincarnate as a non-viable method of immortatity look at "young adult
body", look through the Reincarnate desciprtion, look at "similar cases" such as the Monk/Druid Timeless Body, note that they call out that you still die when you hit your max age, don't see anything in the Reincarnate description that says you now are treated as being age X, and say - sorry, you're still 350 years old. You'll be dead in seven more, with the rolls I made, even though you're now in the body of a 50 year old dwarf.
Of course, even with the first interpertation, it's still not true immortality. There's always that pesky "other" at the end for an annoyed DM. "Wait, what do you mean I was reincarnated as a Homonculus? I'm a Fighter!"