I am old vs Mature

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

I am old

Top 1,000 (very common)

Mature

Top 2,000 (common)C1adjective
Most common: I am old
 I am oldMature
Pronunciation🇬🇧 //aɪ əm əʊld//🇺🇸 //aɪ æm oʊld//🇬🇧 //məˈtjʊə//🇺🇸 //məˈtʃʊr//
MeaningI have been alive for a long time.Fully grown or developed.
ExampleI am old enough to know better.He is a very mature individual for his age.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 2,000 (common)
CEFR level-C1
Part of speechadjective
CollocationsI am old now, I feel old, am I too oldmature audience, mature relationship, mature decisions, mature tree, mature products
Antonyms-immature, undeveloped, young
Common mistakesUsing 'am' instead of 'are' with plural subjects., Confusing 'old' with other age-related terms like 'elder' or 'senior'.Confused with 'immature' for opposites., Using 'mature' for young people or animals., Omitting the context when 'mature' implies wisdom.
Usage notesUse this phrase when stating your age; appropriate for casual conversations. Avoid in formal situations.Use 'mature' to describe fully developed people, animals, or things. Avoid using it to describe young subjects.

See it in real clips

I am old

Frequently asked questions: I am old vs Mature

What's the difference between I am old and Mature?

I am old: I have been alive for a long time. Mature: Fully grown or developed.

Which is more common: I am old and Mature?

I am old is the most common in everyday English.

Can you show an example of each?

I am old: I am old enough to know better. Mature: He is a very mature individual for his age.

Can I use I am old and Mature interchangeably?

Not always. I am old and Mature 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