it's 30 years old (launched in 1986)
CJ and Lear 45 series are nearly 25 years old...
I just ran this and if you climb to FL470 halfway through the flight, with no alternate and no taxi fuel, you land with 610lbs. I've seen a CJ classic land with 600lbs in the tanks once but that was deliberate because it was before maintenance, VFR, with airfields everywhere.
The SJ30 is an impressive aircraft though and if I had $9m to spare and they had made a dozen more of them, I would consider it over the CJ4 which is similarly priced.