You can, but it's gonna be weird =) What we call a "vieux garçon" in french, is someone who is still not married after an advanced age. It means he's gonna end his life alone. You can say : Je suis une personne âgée (sound like "I'm an elder people") But 68 isn't that old so you can just say : Je suis un retraité de 68 ans Which means "I'm a 68yo retired man." Cheers !