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Demystifying Generations: What Are 20 and 30 Year Olds Called?

4 min read

Did you know there are formal, Latin-derived terms for people in their 20s and 30s? Beyond 'young adults,' understanding what are 20 and 30 year olds called helps us explore the unique life stages of vicenarians and tricenarians.

Quick Summary

People in their 20s are called vicenarians, while those in their 30s are known as tricenarians. These terms define crucial decades of personal growth, career development, and financial transition.

Key Points

  • Vicenarian: A formal term for a person in their 20s, specifically someone aged 20 to 29.

  • Tricenarian: A formal term for a person in their 30s, specifically someone aged 30 to 39.

  • Latin Roots: These names derive from Latin numbers: 'vicenarian' from 'viginti' (twenty) and 'tricenarian' from 'triginta' (thirty).

  • Age vs. Generation: Vicenarian/tricenarian are age-based labels that change as a person ages, unlike fixed generational cohorts like Millennials or Gen Z.

  • Foundations for Aging: The lifestyle, financial, and health habits established during these two decades are critical for long-term well-being and healthy aging.

  • Distinct Life Stages: The 20s are typically focused on exploration and establishment, while the 30s are centered on building and consolidation in career and family life.

In This Article

Unpacking the Terminology: Vicenarian and Tricenarian

While terms like "20-something" and "young adult" are common in everyday conversation, more formal labels exist to define these crucial decades of life. A person between the ages of 20 and 29 is known as a vicenarian. Similarly, someone between the ages of 30 and 39 is called a tricenarian. These words are part of a larger system of Latin-derived terms used to classify people by their decade of life, which also includes quadragenarians (40s), quinquagenarians (50s), and so on.

The term 'vicenarian' originates from the Latin vīcēnārius, related to viginti, meaning "twenty". Likewise, 'tricenarian' comes from the Latin trīcēnārius, stemming from triginta, meaning "thirty". Though not frequently used in casual speech, these terms provide a precise way to reference these age groups in demographic, sociological, and health-related contexts.

Life in Your 20s: The Vicenarian Voyage

The vicenarian decade is often a period of immense transition and self-discovery. It's characterized by significant life events and decisions that lay the groundwork for the future. Key themes for vicenarians include:

  • Higher Education and Career Launch: Many are finishing university degrees, entering the workforce for the first time, and beginning to climb the career ladder.
  • Financial Independence: This is often the first time individuals manage their own finances, from budgeting and paying bills to grappling with student loan debt.
  • Social and Personal Development: Vicenarians are solidifying their identities, forming meaningful relationships, and often moving away from their family homes. They are exploring their place in the world as independent adults.

Life in Your 30s: The Tricenarian Transformation

The tricenarian decade builds upon the foundations laid in the 20s, but often with a shift in priorities. It is a period of settling and building, marked by increasing stability and responsibility.

  • Career Advancement and Specialization: Many tricenarians are focused on advancing in their chosen careers, seeking promotions, and establishing themselves as experts in their fields.
  • Major Life Milestones: This decade frequently involves significant commitments, such as getting married, buying a first home, and starting a family.
  • Financial Consolidation: The focus often shifts from simply earning to strategic financial planning, including saving for retirement, investing, and managing household budgets.

Age-Based Labels vs. Generational Cohorts

It is crucial to distinguish between age-based terms like vicenarian and generational labels such as Millennial or Generation Z. An age cohort (like vicenarian) is a statistical group of people of a specific age at a particular point in time. A generational cohort is a group of people born within a similar span of years who share key life experiences and cultural touchstones.

For example, in 2025, a 25-year-old is a vicenarian and a member of Gen Z. A 35-year-old is a tricenarian and a Millennial. However, in ten years, that 25-year-old will become a tricenarian but will always remain a member of Gen Z. The age-based label changes, but the generational one does not. This distinction is vital for understanding societal trends, as it separates the effects of age and life stage from the unique historical and cultural context of a generation.

Comparison: Vicenarian vs. Tricenarian (as of 2025)

Feature Vicenarian Tricenarian
Age Range 20–29 years old 30–39 years old
Common Life Stage Exploration & Establishment Consolidation & Building
Dominant Generation Generation Z Millennial
Primary Focus Finishing education, starting a career, gaining independence Career advancement, starting a family, homeownership
Financial Outlook Managing debt, learning to budget, initial savings Serious retirement planning, investing, wealth accumulation

The Foundation of Healthy Aging Starts Now

Understanding the distinctions between these decades is more than a terminological exercise; it's fundamental to the concept of healthy aging. The habits, decisions, and plans made during one's 20s and 30s have a profound and lasting impact on long-term physical, mental, and financial well-being. Proactive choices in these years are the best investment for a secure and healthy future.

  1. Develop Healthy Lifestyle Habits: Establishing a consistent routine of balanced nutrition, regular physical activity, and adequate sleep in your 20s and 30s can prevent chronic diseases later in life. Avoiding smoking and moderating alcohol intake are also critical.
  2. Prioritize Mental and Emotional Well-being: Learning to manage stress, fostering strong social connections, and seeking support for mental health challenges are skills that build resilience for a lifetime.
  3. Engage in Proactive Financial Planning: The power of compound interest makes starting retirement savings in your 20s incredibly effective. Tricenarians should focus on maximizing contributions to retirement accounts like a 401(k) or IRA, diversifying investments, and planning for future expenses like children's education. For authoritative guidance, the National Institute on Aging offers resources on making healthy choices at every life stage.

Conclusion: Beyond the Labels

Whether you're a vicenarian navigating the exciting uncertainties of early adulthood or a tricenarian building a stable and meaningful life, these labels help frame the common experiences of each decade. They highlight periods of immense growth, challenge, and opportunity. Ultimately, these terms are simply tools. The most important thing is to use the time within these formative decades to make conscious choices that support a long, healthy, and fulfilling life, setting a positive trajectory for all the decades that follow.

Frequently Asked Questions

A person in their 20s (from age 20 to 29) is formally called a vicenarian. More common terms include '20-something' or 'young adult'.

A person in their 30s (from age 30 to 39) is formally called a tricenarian. Informally, they are often referred to as a '30-something'.

Yes. Following the same Latin-based pattern, a person in their 40s is a quadragenarian, in their 50s is a quinquagenarian, and in their 60s is a sexagenarian.

These terms are not very common in everyday conversation but are used in more formal, academic, or demographic contexts to precisely define an age group by decade.

'Tricenarian' refers to someone's current age (30-39), while 'Millennial' refers to the generation they were born into (roughly 1981-1996). In 2025, many tricenarians are Millennials, but a person's status as a tricenarian is temporary, while their generational cohort is permanent.

Habits related to diet, exercise, sleep, and financial planning formed in these decades have a compounding effect over a lifetime. Good habits are the foundation for preventing chronic disease and ensuring financial security in later life.

A tricenarian should focus on accelerating their financial growth. This includes maximizing contributions to retirement accounts (like a 401(k)), paying down high-interest debt, building a robust emergency fund, and beginning to invest more broadly for long-term goals.

References

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Medical Disclaimer

This content is for informational purposes only and should not replace professional medical advice. Always consult a qualified healthcare provider regarding personal health decisions.