Legolas: I can not go back.
Thranduil: Where will you go?
Legolas: I do not know.
Thranduil: Go to the North. There is a member of the Dunedain you should meet and stay with. His father was a good man, I have hope he will be a great one.
Legolas: What is his name?
Thranduil: He is known as Strider. His true name, you must discover for yourself.
Kili: I will not hide, when others fight our battles for us!
Thranduil: So this is the Halfling who ate my food, and stole keys from my guard.
Bilbo Baggins: Yes. Sorry about that.
Thorin Oakenshield: Farewell, Master Burglar. Go back to your books, your fireplace. Plant your trees, watch them grow. If more of us valued home above gold, it would be a merrier world.
Bilbo Baggins: One day I'll remember. Remember everything that happened: the good, the bad, those who survived... And those that did not.
Answer: Aragon is 87 in LOTR: Two Towers (as mentioned in the extended edition). The Hobbit takes place about 60 years before that so Aragon is 27 at the time. Sauron is banished to Mordor in Battle of the 5 Armies. You see his "spirit" flee and the White Council, mention he went back to the east. Between Sauron and Sarumon, it's mentioned more in other LOTR books, but Sarumon (while still technically good) has been looking for the One Ring. He does not join Sauron as much as uses the alliance for his benefit hoping to find the ring first.