彼は彼女より3つ年上です。
tbd
He's three years older than her.
He's three years older than she is.
He is older than she is by three years.
より
1. than
2. rather than, instead of, over, above
3. from, out of, since, at, on (and after)
4. except, but, other than
5. more
更,更加