Elderly adult getting extremely doddery, initially (4)

I believe the answer is:

aged

'elderly' is the definition.
(synonyms)

'adult getting extremely doddery initially' is the wordplay.
'initially' indicates taking the first letters.
The first letters of 'adult getting extremely doddery' is 'AGED'.

(Other definitions for aged that I've seen before include "not like a callow youth" , "Grew older" , "Old or ancient" , "Got older" , "Like Uncle Arly" .)

I've seen this clue in The Telegraph.

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