So, at the exam, it’s better to use the 1 one.The first is preferred by older purists.
The second is considered normal and natural by most native speakers.
Are you asking us or telling us?So,at thein an exam, it’s better to use the1first one.
I'm asking.Are you asking us or telling us?
In that case, you should have worded it as a question. See below.I'm asking.
I recommend you use the first one.So,at thein an exam,it’sis it better to use the1first one?
None of the examination boards I worked with would have penalised any candidate who produced He's older than I. It is correct!
My grandfather (born in 1921) would have used 2 and 4. I don't think I ever heard him use 1 and 3 but it's possible.Using the same pattern with other subject pronouns, the following don't sound at all natural to me:
Our brothers are older than we.
You are taller than she.
We are smarter than they.
I'm cleverer than he.