In the US the age of a Falcon will only change the nature of your clients. You do have the advantage that GA is respected as common transportation, plenty of customer. Get a brand new aircraft, you get the rich and blinkyblinkies. Get a mid age aircraft and transport the notsopoors. Get an older aircraft and you get ordinary people, aviation enthusiasts and rich undercover.
Europe is different, in some countries at aircraft age 5 you start to get a problem and at 10 you are ready to sell to the US. Only few company whores fly older.