The Hobbit Revisited

Wait, how would it be possible for Aragorn to be involved in anything going on during the Hobbit's timeline? Bilbo is supposed to be around 50 when the story starts. I started re-reading Lord of the Rings a couple weeks ago, and it says that Bilbo and Frodo share a birthday, and Frodo was turning 30 (age of maturity) at Bilbo's 111th. Then he doesn't even start HIS journey until he's 50. So even putting Aragorn at 20 years old during the events of the Hobbit, that would make him 110 years old once he meets up with Frodo... Have they ever mentioned that humans in the Tolkien universe live longer than us?