Discuss the theme of John Milton's sonnet "How soon hath time."i dont really get this stuff

Well, you are sixteen years old, or something like that,
right? Don't feel bad for not getting it. The poem was written by a young man who was a
good seven years older than you are now. Thus fret not about the fact that Milton's
Sonnet 7 "ON HIS BEING ARRIVED AT THE AGE OF 23" is a bit tough for you to
understand.

Generally, the theme of the poem deals with age
and aging. The narrator (you wouldn't be wrong if you figured it was Milton himself on
or near his twenty-third birthday) is talking about being and acting his age. In the
first eight lines, he says something like: My, how time flies, and here I am
twenty-three already. How did that happen so fast. And, although I may not look my
age:

Perhaps
my semblance might deceive the truth,
That I to manhood am arrived so
near,

nonetheles, here I am
almost a man.

The last six lines are a reassurance. He
realizes that whether or not he looks it, or is quite ready, he will soon enough blossom
into the man and poet he has so diligently prepared himself to
be.