------------------------------ MODULE HumanLife ------------------------------
EXTENDS Naturals, Sequences

CONSTANTS
    MaxAge      \* Maximum age humans can live
    Events      \* Set of possible events/actions in a human life
    States      \* Set of possible states in a human life

VARIABLES
    age         \* Current age of the individual
    state       \* Current state of the individual (e.g., childhood, adulthood, old age)
    history     \* Sequence of past events in the individual's life

Init ==
    /\ age = 0
    /\ state = "childhood"
    /\ history = <<>>

Next ==
    /\ age < MaxAge
    /\ \/ state = "childhood" /\ ...
       \/ state = "adulthood" /\ ...
       \/ state = "old age"   /\ ...

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