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Rather elderly for such speed? (7)

Ross

I believe the answer is:

seventy

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This clue might be a double definition.

'rather elderly for' is the first definition.
The definition suggests a singular noun which matches the answer.

'speed?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'such' is the link.

Can you help me to learn more?

(Other definitions for seventy that I've seen before include "LXX" , "Threescore and ten" , "A number" , "Three score years and ten" .)

I've seen this clue in the Evening Standard.
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