Still, there are ways to do it. Commission an alchemist to create an immortality elixir. Find the Fountain of Youth. Strike a deal with a higher (or lower) power.
Outside of gaining the Unaging Merit post-char gen, there is another way to get to the future: find a place where the flow of time is convoluted. Step in, step out, and suddenly you're decades in the future.
I'll give you a set up. Somewhere in the world is a place called the Cave of Eternity & Whispers. Those who wander in do not return in the lifetime of anyone who would remember them, but wander out ages hence. Some people who exit the cave speak dead tongues, and swear allegiance to dead empires. Word tells of a Primeval Mage, who stepped out as if from the murky depths of pre-history, when the world was young.
Find that Cave, and you find a ticket to the Future. Or the Past, perhaps. More impossible things have happened.