I don't know why you think Grey Vetiver would make you smell older. It is a fresh, modern vetiver. I like vetivers a lot, they're fresh, durable, but elegant enough to work in most occasions. So I would go with that.
Terre d'Hermes is probably the smoothest of the lot, perhaps a touch uninspiring, but it works well. If you like things on the fresh side, I'd also add YSL Rive Gauche, a fresh fougere. If you like sweeter, I'd say you can try the very elegant and warm Chanel Egoiste (the regular egoiste, not the platinum egoiste).