Reader’s question: Which is correct?
He is younger than me.
He is younger than I.
Answer: I think I is more correct in formal English, but me is acceptable in informal English and is increasingly used in formal English too.
I is more ‘correct’ because you’re comparing two subjects.
However, when I did some more more research, I discovered that the distinction also hinges on whether you regard than as a conjunction or preposition.
If you see than as a conjunction, then ‘He is younger than I’ is correct. The second construction, ‘He is younger than me’, is using than as a preposition and this construction has been around since the C16.
Grammar!
You can read more at http://grammar.quickanddirtytips.com/than-I-versus-than-me.aspx
Online grammar programs
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