We just got back from a stay at the New York so I know the answer to this one! The skating rink is open from 2.30 - 6.30 and then from 7.30 to 10.30. Skate hire is 12 euros for adults and 9 for kids. No mention of age limits at all. We were there from tuesday to friday of last week and the rink was pretty quiet whenever we passed. Myself and DS (almost 3) gave it a whirl but only lasted 10 mins but at least we tried!!
HTH
Tracy x