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Another aspect that is controlled by age is lifespan. This is determined by the {{token|MAXAGE}} token, which if present determines the minimum age at which a given creature may die of old age, and the maximum age that may be reached before death is guaranteed. Most organic creatures will eventually die of old age (including fortuitous fortress dwarves), usually within a range of 1-100 years. [[Savage|Giant]] versions of animals inherit their normally-sized brethrens' lifespans, while [[animal people]] usually have somewhat longer lifespans than their representative creatures. A few species, such as [[elf|elves]], [[goblin]]s, and some unintelligent and unnatural creatures, will live until they are killed. [[Megabeast]]s, the [[undead]], [[night creature]]s, and the procedurally generated [[forgotten beast]]s and [[titan]]s are similarly immortal. This immortality is due to such creatures either lacking a {{tt|[MAXAGE]}} token, or having acquired the [[Syndrome#CE_ADD_TAG|NO_AGING]] syndrome tag. Immigrants may sometimes show up with incorrect ages (future birthdates) {{Bug|3945}} or incorrect life stages (4 month old children) {{Bug|3752}}.  This normally does not cause a problem, and life stages get rechecked every birthday. Note that only an intelligent civilized creature vulnerable to death by expiration will seek [[necromancer|necromancy]], which means goblins and elves never become practitioners of the dark arts.
 
Another aspect that is controlled by age is lifespan. This is determined by the {{token|MAXAGE}} token, which if present determines the minimum age at which a given creature may die of old age, and the maximum age that may be reached before death is guaranteed. Most organic creatures will eventually die of old age (including fortuitous fortress dwarves), usually within a range of 1-100 years. [[Savage|Giant]] versions of animals inherit their normally-sized brethrens' lifespans, while [[animal people]] usually have somewhat longer lifespans than their representative creatures. A few species, such as [[elf|elves]], [[goblin]]s, and some unintelligent and unnatural creatures, will live until they are killed. [[Megabeast]]s, the [[undead]], [[night creature]]s, and the procedurally generated [[forgotten beast]]s and [[titan]]s are similarly immortal. This immortality is due to such creatures either lacking a {{tt|[MAXAGE]}} token, or having acquired the [[Syndrome#CE_ADD_TAG|NO_AGING]] syndrome tag. Immigrants may sometimes show up with incorrect ages (future birthdates) {{Bug|3945}} or incorrect life stages (4 month old children) {{Bug|3752}}.  This normally does not cause a problem, and life stages get rechecked every birthday. Note that only an intelligent civilized creature vulnerable to death by expiration will seek [[necromancer|necromancy]], which means goblins and elves never become practitioners of the dark arts.
  
Age does not interfere with a creature's physical or mental [[skill]]s, attributes or behavior; a 150 year old dwarf is as capable as an 18 year old one. Despite most [[vermin]] possessing a noted {{tt|[MAXAGE]}}, they do not seem to be affected by aging; a tamed vermin creature will last forever, even if it would otherwise die after a single year.
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Age does not interfere with a creature's physical or mental [[skill]]s, attributes or behavior; a 150 year old dwarf is as capable as a 12 year old one. Despite most [[vermin]] possessing a noted {{tt|[MAXAGE]}}, they do not seem to be affected by aging; a tamed vermin creature will last forever, even if it would otherwise die after a single year.
  
 
The game checks if a creature will die of old age at the beginning of every new year, on the 1st of Granite. In longer-running fortresses, several animals and livestock with short life spans could die at the same time. A creature's lifespan is determined at birth, so restoring from a previous seasonal autosave will ''not'' give them a chance to live longer.
 
The game checks if a creature will die of old age at the beginning of every new year, on the 1st of Granite. In longer-running fortresses, several animals and livestock with short life spans could die at the same time. A creature's lifespan is determined at birth, so restoring from a previous seasonal autosave will ''not'' give them a chance to live longer.
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== Mechanics ==
 
== Mechanics ==
 
The mechanics of aging are defined by [[creature token]]s within creatures' [[raw file]]s, and can easily be modified by those looking to make changes to their game.
 
The mechanics of aging are defined by [[creature token]]s within creatures' [[raw file]]s, and can easily be modified by those looking to make changes to their game.
*{{tt|[CHILD:#]}}: Age at which children become adults. Set to 1 for most creatures, up to 10 for a few ([[giraffe]], [[elephant]]), and is set to 18 for most sapient creatures.
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*{{tt|[CHILD:#]}}: Age at which children become adults. Set to 1 for most creatures, up to 10 for a few ([[giraffe]], [[elephant]]), and is set to 12 for most sapient creatures.
 
*{{tt|[BABY:#]}}: For sapient creatures, age at which babies become [[children]]. Always set to 1.
 
*{{tt|[BABY:#]}}: For sapient creatures, age at which babies become [[children]]. Always set to 1.
 
*{{tt|[BODY_SIZE:#:#:#]}}: Controls the body size of the creature, typically two or more are used to constrain its growth pattern. The first number is age in years; the second additional age in days. The third number is its size in cm<sup>3</sup>. The body size points are independent of the age of adulthood for the animal: many animals are adults in one year, but take two years to reach their full size, for instance.
 
*{{tt|[BODY_SIZE:#:#:#]}}: Controls the body size of the creature, typically two or more are used to constrain its growth pattern. The first number is age in years; the second additional age in days. The third number is its size in cm<sup>3</sup>. The body size points are independent of the age of adulthood for the animal: many animals are adults in one year, but take two years to reach their full size, for instance.

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