After twelve months, we have years. The month-counting habit that persists past that point makes no sense for anyone in the conversation. Hellbeing on the hard line and why it exists.
Estimated reading time: 4 minutes
Your Kid Is Not 23 Months Old. They Are Almost Two.
There is a hard line here and it is twelve months. Before twelve months, counting by months makes sense. The developmental difference between a two-month-old and a nine-month-old is significant enough to warrant precision. After twelve months, we have years. We have been using years to describe human age for the entire documented history of human civilization. The system exists. It works. It requires no supplemental math from the listener.
What Happens After Twelve Months
Your child turns one. You say they are one. Six months later, you say they are one and a half. At twenty-four months, you say they are two. The language already has all of this built in. “One and a half” is four syllables. “Eighteen months” is also four syllables. One of these requires the other person to perform arithmetic. The other one does not. There is no argument for the one that requires arithmetic.
When someone tells you their child is twenty-seven months old, you have to divide by twelve to understand what they said. Twenty-seven divided by twelve is two point two five, which rounds to two. The child is two. You could have said two. You chose to say twenty-seven months. This is a choice made consciously, while having access to the word two, while knowing that the person you were speaking to would need to do math to process information that could have been delivered in a single syllable.
Who This Is For
This is not for parents of newborns. A four-month-old and a nine-month-old are genuinely different in ways that matter. The month system is useful there. It was designed for that stage. The stage ends at twelve months. After that, the month system is not providing precision. It is providing a signal that the speaker wants you to be aware of exactly how long their child has existed, down to the month, which is a level of specificity that benefits no one in the conversation.
The child can walk. The child has opinions about snacks. The child throws things when displeased and selects which video they want by pointing at the screen with unmistakable intent. This is not a creature who needs to be described in monthly increments. This is a small person. Small people have ages in years. This one is two.
The Rule
If the number of months is over eleven, you say years. One. One and a half. Two. Two and a half. Three. These are all available. They require no division. They communicate the information completely. They leave the other person able to simply receive the information rather than process it.
The phrase “he’s twenty-two months” contains the number twenty-two and the word months. The phrase “she’s almost two” contains the number two. The second one is better in every measurable way. It is shorter, clearer, and does not involve the listener consulting a conversion table they did not agree to need.
More at Infernal Insights. Hellbeing apparel — sized in years, not months.
Frequently Asked Questions
At twelve months. Before twelve months the developmental differences between ages are significant enough to warrant month-level precision. After twelve months the language already has what you need — one, one and a half, two, two and a half. These require no division from the listener.
Usually out of habit formed during the first year when months genuinely mattered. The habit persists because nobody tells them to stop. It also carries a certain specificity that feels informative even when it requires the listener to do arithmetic to understand what age is being described.
Yes — because it requires the listener to divide by twelve to understand what is being said. The child is two. That information could be communicated in a single syllable. Choosing twenty-seven months instead is a communication choice that prioritizes the speaker’s precision over the listener’s convenience.