What is the effect of envisioning “aged years” as needing a staff in these lines from the passage?

by that time will my aged years
perhaps a staff require:
it evokes the comfort that the elderly feel knowing that a younger generation will replace them.
it reminds the reader that the speaker will be aged by the time she can see the youths as adults.
it suggests that the speaker feels distant and isolated from the young people of her time.
it reveals how weary the speaker is of waiting to see what effect she might have had on others.