How to Talk About Age and Life Stages

When meeting new people or sharing stories about family and friends, discussing age comes up all the time. However, natural English speakers rarely just announce a number. Instead, we use rich vocabulary, descriptive phrases, and specific grammatical patterns to talk about different stages of life.

Mastering these terms will make your conversations sound much more natural and precise. Let us walk through the most common words and grammar rules for every age and life stage.

Vocabulary for Every Life Stage

English has distinct nouns and adjectives to describe someone at each point along life's journey. Here is how we break them down from earliest childhood to the senior years:

• Newborn (0 to 2 months): A baby that has just been born.
• Example: "They just welcomed a healthy newborn baby girl."
• Infant / Baby (0 to 1 year): A very young child who cannot yet walk or talk.
• Example: "The nursery is set up with everything an infant needs."
• Toddler (1 to 3 years): A child who is just learning to walk (to "toddle").
• Example: "Running after a curious toddler takes a lot of energy!"
• Child / Kid (roughly 3 to 12 years): Someone who has passed toddlerhood but is not yet a teenager. Between 9 and 12, they are often called a pre-teen or tween.
• Example: "School-age children need plenty of outdoor play."
• Teenager / Adolescent (13 to 19 years): Anyone whose age ends in "-teen".
• Example: "Most teenagers value independence and spending time with peers."
• Young adult (late teens to late twenties): Someone transitioning into independent adulthood.
• Example: "University is an exciting period for many young adults."
• Middle-aged adult (roughly 45 to 65 years): The stage between early adulthood and retirement.
• Example: "He decided on a career change as a middle-aged professional."
• Senior / Older adult / Retiree (usually 65+): Respectful terms for people in later life.
• Example: "The community center offers digital literacy workshops for seniors."

Grammar Rules for Expressing Age

Describing how old someone is requires careful attention to prepositions, hyphens, and verb choice. Here are the most essential grammar structures:

1. Using "To Be", Never "To Have" Unlike Romance languages (such as Spanish, French, or Italian), English never uses the verb have to state age. Always use the verb to be. Correct: "She is 32 years old." or simply "She is 32." Incorrect: "She has 32 years."

2. Hyphenated Compound Adjectives When an age functions as an adjective directly before a noun, connect the words with hyphens and keep the word year singular. Compound adjective (before noun): "They have a four-year-old son." Predicate adjective (after verb): "Their son is four years old."

Notice that when the phrase comes after the verb is, there are no hyphens, and years takes the plural -s.

3. Vague Ages and Decades If you do not know someone's exact age, or if giving the exact number feels too private, you can describe the decade using in + possessive pronoun + decade: In their early twenties: roughly 20 to 23. In their mid-thirties: roughly 34 to 36. In their late fifties: roughly 57 to 59. Example: "Marcus is in his early forties, but he looks younger." Example: "She started her first business in her late twenties*."

You can also add the suffix -ish in casual conversation: "He is forty-ish" (around forty years old).

Useful Idiomatic Expressions About Age

Native speakers often use colorful expressions when discussing maturity and aging:

• To come of age: To reach legal adulthood or emotional maturity.
• Example: "She truly came of age during her year studying abroad."
• To act your age: To behave with the maturity expected of someone your age (often used as an instruction to stop acting childish).
• Example: "Please stop fighting over the remote control and act your age!"
• In the prime of life: At the peak of health, vigor, and success.
• Example: "At thirty-five, she felt like she was in the prime of her life."
• Turn [a number]: To reach a specific birthday.
• Example: "My grandfather is turning eighty next weekend."

Common Mistakes

• Pluralizing hyphenated age adjectives: Saying "a seven-years-old girl" is incorrect. Remember that English adjectives do not take plural forms. Say "a seven-year-old girl".
• Saying "years" without "old": You can say "I am 28" or "I am 28 years old", but never "I am 28 years".
• Overusing "elderly": While grammatically correct, calling an individual "an elderly" sounds unnatural and sometimes impolite. Use "an older person", "a senior", or use elderly strictly as an adjective with care ("elderly residents").
• Forgetting "her/his" in decade phrases: Saying "He is in thirties" is missing the possessive adjective. Always include it: "He is in his thirties."

Practice It Today

Test what you have learned with these three quick exercises. Write down your answers before checking the solutions below!

1. Sentence Correction: Find and correct the error in this sentence: "Maria has twenty-five years and works as an architect."
2. Choose the Right Form: Select the correct phrase: "They adopted a (three-year-old / three-years-old) golden retriever yesterday."
3. Decade Transformation: Rewrite this sentence using "in his mid-": "David is 45 years old."

Answer Key 1. "Maria is twenty-five (years old) and works as an architect." (Use the verb to be, not has.) 2. "They adopted a three-year-old golden retriever yesterday." (Hyphenated and singular before the noun.) 3. "David is in his mid-forties."