How do I tell what my fare class is?
 

I just got upgraded to lifetime gold and I understand that upgrade policy has something to do with fare class.

How do I find out what the class is?

Thanks in advance.

Your class is only available in the fare rules at the time of ticketing, or on your boarding pass.
You should call your travel agent or AA to get the class of service, after the fact.
As for lifetime gold, the upgrade rules for you are the same as any other gold. I think they now comp gold to next class of service if space is available, and ticket is Y or B class.