The two elders are 70 years old, in good health, and have no companions. Are they able to go on a cruise?

This is fine, but the two elders need to have good health themselves, and not get seasick would be best.
I’m sorry! I don’t know, I suggest you call directly to ask.
This is okay, but the two elders need to have good health themselves, and it’s best if they don’t get seasick.
I’m sorry! I don’t know. I suggest you call and ask directly.