Aged vs Mature vs Older vs Senior

When to use each in English, with meaning, register, and examples.

Aged

Top 3,000 (common)B1

Mature

Top 2,000 (common)C1adjective

Older

Top 1,000 (very common)

Senior

Top 2,000 (common)B2adjective
Most common: Older
 AgedMatureOlderSenior
Pronunciation🇬🇧 /["/eɪdʒd/","/ˈeɪdʒɪd/"]/🇺🇸 /["/eɪdʒd/","/ˈeɪdʒɪd/"]/🇬🇧 //məˈtjʊə//🇺🇸 //məˈtʃʊr//🇬🇧 //ˈəʊldə//🇺🇸 //ˈoʊldər//🇬🇧 /["/ˈsiːniə(r)/"]/🇺🇸 /["/ˈsiːniər/"]/
MeaningHaving lived for a long time; old.Fully grown or developed.Having lived for a long time; not young.An older person, often retired.
ExampleThey have two children aged six and nine.He is a very mature individual for his age.My sister is older than I am.The senior members of the team provided valuable insights during the meeting.
RegisterNeutralNeutralNeutralNeutral
How commonTop 3,000 (common)Top 2,000 (common)Top 1,000 (very common)Top 2,000 (common)
CEFR levelB1C1-B2
Part of speechadjectiveadjective
Collocationsaged cheese, aged whiskey, aged care, aged populationmature audience, mature relationship, mature decisions, mature tree, mature productsolder sister, older brother, older than, older generation, older agebe, very, fairly, quite, to
Antonymsyoung, fresh, newimmature, undeveloped, youngyounger, newerjunior, youthful
Common mistakesConfusing with 'age,' which refers to the period of living., Using 'aged' incorrectly as a verb instead of an adjective., Mixing up 'aged' with words like 'elderly' which refer specifically to people.Confused with 'immature' for opposites., Using 'mature' for young people or animals., Omitting the context when 'mature' implies wisdom.Confusing 'older' with 'old' (older is comparative, while old is descriptive)., Using 'older' without 'than' when comparing., Incorrectly applying 'older' to inanimate objects.Confused use of 'senior' to mean 'senior citizen' exclusively when it can refer to anyone older., Using 'senior' as a noun without context (it's better as an adjective)., Mixing up 'senior' with 'elderly' which can imply frailty.
Usage notesUse 'aged' to describe people or objects that have existed for a long time. It can be used formally (e.g., aged 65) or informally (e.g., aged wine). Avoid using it for young subjects.Use 'mature' to describe fully developed people, animals, or things. Avoid using it to describe young subjects.Use 'older' to compare ages. It's neutral but can be informal in everyday conversations. Avoid using it for sensitive contexts.Use 'senior' when referring to older adults or someone in a higher position. Avoid in contexts where age might be sensitive; instead, say 'older adult'.

See it in real clips

Older
Senior

Frequently asked questions: Aged vs Mature vs Older vs Senior

What's the difference between Aged, Mature, Older, and Senior?

Aged: Having lived for a long time; old. Mature: Fully grown or developed. Older: Having lived for a long time; not young. Senior: An older person, often retired.

Which is more common: Aged, Mature, Older, and Senior?

Older is the most common in everyday English.

Which is more advanced: Aged, Mature, Older, and Senior?

Mature is the highest level, at C1, on the CEFR scale.

Can you show an example of each?

Aged: They have two children aged six and nine. Mature: He is a very mature individual for his age. Older: My sister is older than I am. Senior: The senior members of the team provided valuable insights during the meeting.

Can I use Aged, Mature, Older, and Senior interchangeably?

Not always. Aged, Mature, Older, and Senior are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

Related comparisons