Quick update to bring the mod up to 1.6.

-Updated to 1.5 (It technically worked already).
-Fixed patch for Big and Small Genes (they changed the name, breaking the patch I had made). Undead pawns should be immune to Old Age and Natural Degradation again.

Small update adding compatibility for the mod Big and Small Genes, specifically the Deathlike Body gene. Pawns with this gene will not get/be immune to Old Age and Degradation.

Small update to add Ideology compatibility, specifically in regards to the Biosculptor. It's BioRegeneration option can now remove both Old Age and Degradation.

Note that the Biosculptor's behavior is that it removes one random condition when running a regeneration cycle so it may take several runs to remove the hediffs completely.

Quick update to add compatibility to Sanguophages in Biotech, specifically their "Non-senescent" gene.

Pawns with that gene will not get the conditions from this mod.

-Mod tested with and updated for 1.4.

Small tweaks included for all versions:
-Old Age can now only occur past 100% life span (starting at 80 for humans)
-Old Age and Degradation severity rates have been increased, without tending Old Age reaches max severity after ~4.5 days (2.5 days for Degradation).
-To offset these changes, Old Age's progression can now be halted/reversed with Industrial Medicine with a 95% tend quality or above (70% or above for Degradation making Herbal Medicine viable for halting it's progression).
-Removed surgeries that used Glitter Meds to remove Degradation, they seemed unnecessary given that Herbal Medicine can halt it's progression.

Small update:
-Adjusted the chance curve to get Old Age as follows:
95% of Lifespan (76 for Humans) - 0% chance of getting Old Age
100% of Lifespan (80 for Humans) - 100% of getting Old Age
105% of Lifespan (84 for Humans) - 0% of getting Old Age

This scaling should guarantee that pawns/animals get Old Age right at the height of their lifespan, and that it won't occur again later if you manage to cure it with meds or immortality mods like Celestials. Should reduce the message spam of Old Age occurring on immortal pawns, especially when using Faster Aging. How effective this change is may not be consistent on pawns/animals with much higher lifespans than that of a human.

Changes:
-Improved compatibility with Celestials mod.
-Removed patch for Immortals (they have their own system to handle hediffs like mine).
-Allowed Old Age to be temporarily cured through high quality tending (any med that gives higher than 100% tending). Higher than 100% reduces severity, if severity reaches 0 the condition is removed but it can return later on a pawn's birthday.
-Adjusted the speeds of Old Age's progression. Looking for feedback on the current speed.
-Reduced the amount of glittermeds needed to remove degradation via surgery from 3 to 1. This mod is pretty heavy in how many meds it can cost you, feedback on this change is welcome.

Version 2.0 Rewrite + 1.3 compatibility.

-Pawns/animals that grow past 75% of their lifespan now can get "Old Age", a treatable but incurable condition that causes organic parts to degrade. Later stages of Old Age cause parts to start degrading more frequently. Untended, Old Age takes 15 days to reach it's maximum severity but can be slowed when tended.
-Changed degradation to affect any organic part instead of just the heart, lungs, kidneys and liver. This means mod-added parts can degrade as well if they are tagged as organic. Inorganic parts are safe though. Note that this does allow irreplaceable organic parts such as the brain to receive degradation.
-More options available for treating these conditions. Tend qualities over 100% can reverse the progress of Old Age and Degradation, making glitterworld meds the best way to fight it off. Specifically for Degradation, 3 glitterworld meds can be used to cure it outright with a high skill pawn (medical 10 required). No cure for Old Age though, so Degradation can occur again later.
-Added support for some immortality mods such as [O21] Celestials and Immortals. Pawns with the hediffs from these mods cannot get Old Age or Degradation.

-Adjusted organ failure rates to be per-organ and relate more to real world data. Previously the chances were based on death rates by age group rather than specific data around each organ type.

Note, heart failure will be more common and could happen at any age group while lungs, liver and kidneys are a bit less common and don't start building a chance until around halfway through a creature's life expectancy. Please leave any feedback in comments.