You'll be fine!
Earlier this year the QM2 had a gay charter transatlantic crossing; I've heard the staff worked wonderfully well. They are experienced and any time the ship leaves Red Hook mid-30s gays may even find groups on, booked by Pied Piper, for the ship is very friendly.
The disco there is always a highspot of night life! You may be suprised the passengers will be younger than you'd expect and there'll be many you'll want to know!