There are six different Life Stages in One Hour One Life. Currently, players can either enter the game and be born as an eve (a young woman, without a mother), or a baby (a boy or a girl). Life stages can be divided by a character's age range, 0 to 60 years old. Age's curve also apply in this game, which means a player will start as a weak baby, getting stronger as they mature, and then weaken of old age before they inevitably die.
Note: A year old in-game equals to a minute real-time.
When a player is born as a baby, they spawn in proximity to an adult woman. They can only be breastfed by adult and young adult women (menopause starts at age 40) by being picked up, or they can be fed by any other characters by literally handing them food items. Babies start with 4 blocks in their food meter which grows one block each year/minute as the baby grows, allowing them to survive longer without being fed.
A baby being held by a male or post-menopausal character will not be breast-fed, cannot be manually fed, and is at risk of starving if not dropped, or if the player does not escape and acquire food in time. It pays to pay attention to the age of the mother.
Babies cannot pick up any items, including food. They have limited interaction with their environment, such as goose ponds and chests. It is possible to place clothes and backpacks on babies, and also to indirectly give items (including a knife) within a backpack or apron placed on the baby (Although this is ill-advised as it is also possible to steal a baby's clothing and any contained items by swapping clothing). A baby is able to remove and drop its own clothing but can't pick it back up from the ground.
Babies can speak too! A player can press the "enter" key to type. However, a baby can initially only say 1 character at a time. As they age, they can type more characters, up to 3 as a baby (6 food bars - two characters, 9 bars - four characters). This allows a baby basic communication with it's mother, especially when a baby needs to be fed. The most common way of asking to be fed in-game is by saying "F" for 'food'.
It is advisable for a newborn to learn from an expert in game. A baby is helpless and cannot do anything except be fed and cared for. Babies walk very slowly. This stage is a good time to start observing and learning how to craft and to survive later in game. Planning is the key.
During this stage you are able to pick up any item except for a Hand Cart, Knife and a Yew Bow. While a player can eat food on their own in this stage, they can still be breastfed for two extra years, which is more efficient as it doesn't consume food items, and the mother only loses 1 hunger point for each feed.
In this stage it is recommended to stay near a ready source of food or to always carry food, as the risk of starvation is high. Gooseberry farming is a common task for children, as it allows players to stay near an age-appropriate food source, while tending an important crop used for compost (one of the most important aspects of farming) and wool products.
During this stage, the character will get more food meter capacity until they reach adulthood. Foods with increasingly higher value should be sought out to reduce strain on gooseberry farms. A female character in this stage will be able to give birth to a baby, and breastfeed them. Picking up a baby to breastfeed will fill the baby's hunger meter, and take one bar off of the mother's.
The most common method of child rearing is to leave the baby in a spot with balanced warmth meter (edges of deserts, or beside a fire), and only picking up when the baby gets down to two hunger bars (the baby can signal this by typing 'F' for 'food'). In this way it is possible to rear a child using only three feedings. However, this may not be convenient depending on the stage and location of a civilization.
An adult’s food meter will no longer grow as they age. Pies and stew are common go-to foods for adults, although it is worth aiming to maximize "Yum Bonus" in this stage if convenient. This is the most mobile stage of life, and can be the most productive. Adults retain their all previous abilities until menopause (age 40), when they can no longer birth or nurse a baby, and soon after will become elders.
A female in the elderly stage cannot breastfeed babies any longer, nor give birth to a new baby, making it easier to move and work freely. Characters who reach the elderly stage will begin to lose their food meter capacity by one block every year (a minute real-time) until there's only four blocks left. Similar to babies and children, this will make them prone to die of starvation rather than old age if they didn't prepare an easily accessible food stock (such as a gooseberry plot).
In the later part of this stage, when the character appears especially wrinkled, it is possible to clothe and steal items from the elderly- as with babies (as of update 135, backpacks can no longer be stolen from the elderly). It is advised therefore, to pass on items before this stage is reached. Players in this stage also reach the maximum character length of speech, making it the best stage to pass on complex messages including locations of resources, or any wisdom to teach new players.