What is the youngest age allowed on the kayaks? No info on website and never answer phone.

I saw several families taking their small children in the boats

These are small kayaks meant for, at most, two adults. And you will be out on the Hudson River, with steamboats, cargo ships, yachts, ferries, with wind and waves. You're out in nature. That's the appeal, as well as the risk. The website has the following under General Information: Children must be accompanied by an adult. Safety instructions must be comprehended. Your safety depends on you. You must sign a waiver of liability before boating.