He asked me how old my brother is/was.
Can I use both?
I would only use "is" because the age of your brother is a present fact. " How old was your brother when he ran the marathon? He was 14 years old.
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I would only use "is" because the age of your brother is a present fact.
If you were talking about his age at a particular time, then you could use "was."
How old was your brother when he ran the marathon? He was 14 years old.