Bringing opposition supporters to Palace

I have a good friend of 30 years + who is a great chap but supports Wolves. His local team as a a lad 65 odd years ago. We were talking about our hopes for next season and if the football gods are nice could find ourselves in the same division for the 1st time in ages. In the old days we would find a quiet corner of the Arthur or main stand but wondered what the ettiquite is today. I don't think a 70 year old is going to cause much trouble :D