Sometimes there are exceptions made at some 55+ parks. Usually it has to do with disabilities etc. I would encourage a call to the park and a conversation with the management. I can help with that process as well.
If it is like our area you have to be 55 to live there. They do not normally allow for someone to buy it then rent it out. You will have to check with the local people for rent, etc. I just thought I would let you know that age is a ver specific requirement in these types of parks. They also normally have restrictions on numbers of pets, size and weight.