In this letter you need to have a greater focus on your age and things that are associated with your age. There's only very little said about that.
What's good and bad about it?
.... it seems you don't address this part at all :(
Anyway, I haven't found any disadvantage about this age so far,
.... okk... then tell why. On what grounds you say your life at this age is very advantageous?
You need to have some thought process before you write an essay. First read the prompt carefully and understand the features it is requiring. Then proceed with writing :)