Get old exchange calander to sync with native calander

[68bucks]

So I have a calander on my phone that used to sync to an exchange account. I retired and no longer can connect to the exchange server but the calander is still on my phone. I would like to sync all the info from the old calendar to the native calander on my phone then be done with it. It's mostly I have a bunch of birthdays I'd like to retain on the calendar but I can't seem to get that to happen. Anyone know if that is possible?