In "Ulysses", what does Ulysses think he and his mariners can do before they die, even though they are old?

This poem is famous for its spirit of unyielding adventure
in the face of old age and stability. It's narrator, Ulysses, is famous for his
journeyings back to his island kingdom of Ithaca, and now we are presented with a much
older Ulysses who grows tired of the stability and boredom of his life and has a
desperate, almost frantic desire to have one last adventure before he dies. He does not
want to dwindle or wither away living a life that is marked by its absence of excitement
and adventure. His determination to exact the most out of life is evident in a number of
places in the poem:

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I cannot rest from travel; I will
drink

Life to the
lees.

His commitment to
adventure pushes him to take his faithful sailors and go on, seeking that one last big
adventure before death itself claims them for eternal rest. Note the words of Ulysses as
he calls his mariners to him:

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'Tis not too late to seek a newer
world.

Push off, and sitting well in order
smite

The sounding furrows; for my purpose
holds

To sail beyond the sunset, and the
baths

Of all the western stars, until I
die.

In these famous words,
Ulysses calls for uncompromising action and asserts his determination to continue
pursuing adventure and the unknown in life until his very death.