More words, less access: the paradox of aging

Author: Victoria Guerra-García, PhD candidate at the University of the Basque Country, Dept. of Linguistics and Basque Studies (EHU) and member of The Bilingual Mind Research Group (Gogo Elebiduna)

You’re in the middle of a conversation, and suddenly the word won’t come. You know exactly what you want to say, but you just can’t retrieve it. This happens more often with age. But here is the paradox: older adults actually know more words than younger people. ¹²³

Moments like this may seem trivial, but they reveal something fundamental about how language changes with age. Throughout life, language evolves in complex and sometimes contradictory ways. Although aging is often associated with a general decline in cognitive abilities, the reality is far more complex. Understanding these changes can help us make better sense of everyday communication in older age. What may seem like loss is often better understood as a change in how information is accessed, rather than a loss of the information itself.

During healthy aging, some linguistic abilities, such as vocabulary size, tend to remain stable or even increase with age ⁴. This means that older adults often possess a broader lexical repertoire than younger individuals. However, having more words in memory does not necessarily translate into more efficient language use. We know that some language processes, particularly those involving word retrieval and processing speed, tend to become less efficient ⁵. These difficulties are often reflected in slower word retrieval, increased pauses during speech, and more frequent failures to retrieve well-known words ⁶. Importantly, these changes do not reflect a loss of knowledge, but a reduced efficiency in accessing that knowledge.

This apparent contradiction raises a deeper question: if older adults retain —and even expand— their knowledge, what exactly makes access to that knowledge more difficult?

Knowing words vs. finding them

To address this question, it is crucial to distinguish between lexical knowledge —the words we know—, and lexical access —our ability to retrieve those words when needed—.

Researchers have studied this using different kinds of tasks, such as asking people to define words, recognize them, or match them to images. Some studies using both verbal (word-based) and non-verbal (picture-based) tasks have found that older people’s word knowledge increases during adulthood ( ⁷; Wu et al., 2024). This is due to the exposure to language in different contexts such as education, reading, and everyday communication (Kavé, 2022). In simple terms, the more we interact with language, the richer our vocabulary becomes.

Across different types of tasks —such as defining words, recognizing them, or matching them to images— studies consistently show that older adults perform as well as or better than younger adults in measures of word knowledge ⁸.

Despite this, one of the most common language-related problems in aging is the inability to retrieve words that are perfectly known (Burke & Shafto, 2004). Speech may also change. Older adults tend to pause more, use fillers like ‘um’, and reformulate what they are saying. One of the most recognizable manifestations of this difficulty is the so-called tip-of-the-tongue (TOT) phenomenon, a frustrating experience in which a speaker knows a word’s meaning but cannot immediately remember it ⁹. One reason for this is that retrieving a word is a time-sensitive process that depends on multiple cognitive resources, such as attention and processing speed. As these processes become less efficient with age, finding the right word at the right moment can become more demanding, even if the word itself is still stored in memory.

A useful way to think about this is to imagine the mind as a library. With age, the library itself often becomes larger, filled with more books, more knowledge, and experience. But the system that helps us find the right book at the right moment may become slower or less efficient.

Importantly, the library and the search system are not entirely independent. When one becomes less efficient, it can affect how we access what we know. This distinction between stored knowledge and access is not unique to language. It reflects a broader pattern in how our cognitive abilities change with age. Some abilities, such as processing speed or attention, tend to become less efficient with age, whereas accumulated knowledge and experience are often preserved. These are often described as “fluid” abilities (how we process information in the moment) and “crystallized” abilities (the knowledge we accumulate over time). However, recent research suggests that they are not completely independent: a large longitudinal study by Elliot M. Tucker-Drob and colleagues showed ¹⁰ that people with greater declines in fluid abilities also tend to show smaller gains —or even declines— in crystallized abilities. In other words, knowledge and access may be different, but they are not isolated systems.

This brings us back to the core puzzle: how can vocabulary grow, while access becomes more difficult?

A paradox explained

A study by Kavé and Yafé (2014) sheds light on the association between vocabulary knowledge and word retrieval across the lifespan. The researchers found a striking contrast: while younger adults were quicker and more accurate at retrieving words, older adults demonstrated a richer and more developed vocabulary. Moreover, while younger individuals often perform better in recognition tasks than in production tasks, older adults show similar performance in both defining and recognizing words (Kavé & Yafé, 2014). In other words, aging enhances word knowledge even if access to that knowledge becomes less efficient.

To illustrate this, consider a simple everyday situation. Imagine you are cooking with your friend, and you need a spatula. You can clearly picture the object and know exactly what it is used for, but the word itself escapes you. Instead, you say: “Can you pass me that tool for flipping food?”. In this case, the concept is intact in your mind, but access to the specific word is “blocked”. The word has not disappeared from memory; it is simply harder to retrieve in that moment.

In short, aging reveals clear paradox: we know more words but cannot always access them when we need them. Vocabulary tends to grow over time, while the mechanisms that help us to retrieve words become less efficient. This means that words are not lost but reaching them can take longer or sometimes fail. Rather than a simple decline, this reflects a shift in how knowledge and access interact in the aging mind.

Conclusion

This distinction challenges the widespread assumption that aging inevitably leads to uniform cognitive decline. Different methodologies and evidence show that while some processes, such as word retrieval, may weaken, others, such as accumulated word knowledge, continue to grow.

This apparent paradox —more words but less access— highlights the importance of distinguishing different linguistic processes. Thanks to decades of psycholinguistic research, we now understand that words are not lost with age, they remain stored in the mind, even if they are harder to retrieve.

Aging is not simply a story of decline but one of transformation. Rather than losing words, we retain them —even if accessing them becomes more demanding. This paradox reminds us that language does not fade with age; it evolves.