New Age greeting? (8,4)

I believe the answer is:

birthday card

I'm a little stuck... Click here to teach me more about this clue!

'new age greeting?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

'age greeting?' is the wordplay.
'age' becomes 'birthday' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'greeting?' becomes 'card' (card is a kind of greeting).
'birthday'+'card'='BIRTHDAY CARD'

Can you help me to learn more?

I've seen this clue in The Times.

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