Admission fee query

I plan to visit Harbin and I note Sun Island Park, Ice and Snow World and Zhaolin Park (Ice Lantern Garden Party ) all offer discounted rates for the elderly between 60 and 69 years old with a valid proof. What sort of proof is required? We have the passports as well as the senior citizen's Freedom Pass Card which we use in the UK. Would that be sufficient?

As language is going to be a problem, do you have a link for this information about the charges for senior citizens in Chinese Language?
Thank you for your help.