DNA allotted to one and all of similar age (10)

I believe the answer is:

generation

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'similar age' is the definition.
'generation' can be an answer for 'age' (thesaurus). I'm not sure about the 'similar' bit.

'dna allotted to one and all of' is the wordplay.
'dna' becomes 'gene' (genes are made up of DNA).
'allotted to' means one lot of letters go next to another.
'one and' becomes 'n' (common abbreviation for 'and').
'all of' becomes 'ratio' (I can't explain this - if you can you should believe this answer much more).
'n' after 'ratio' is 'ration'.
'gene'+'ration'='GENERATION'

Can you help me to learn more?

(Other definitions for generation that I've seen before include "production" , "young" , "About thirty years'" , "what was lost in WW1" , "Group born around same time" .)

I've seen this clue in The Times.

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