PICTURE and book remain,
An acre of green grass
For air and exercise,
Now strength of body goes;
...
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The poet does not wish to go gentle into that good night, but what is left to him in old age? Picture, book and grass for exercising but little challenge to 'make the truth known.' (verse 2) He wishes for an old man's passion, and again invokes his need to be able to summon truth (verse 3) 'An old man's eagle mind' may not be reckoned by mankind, but he is convinced it can still achieve great things. (verse 4) The poem can be seen as a confidence booster by a poet reassuring himself that great work is still within his powers.
Forgotten else by mankind, An old man's eagle mind. Superb conceptualization. Thanks for sharing it here.