Has this gas hot water boiler seen better days?

I am considering Purchasing a home with this baseboard hot water system. I’ve always had forced hot air heating. It’s a Burnham and looks to be about 30 years old, and has 2 zones. I notice a lot of rust on the maze of pipes and rust on the front and below the boiler. I’m trying to gain some pre-inspection knowledge so I can ask the right questions. I don’t need a huge bill next winter if this unit decides to die, or do I want to keep repairing a unit that is ready for the junkyard. I know t here is only so much that can be learned from a photo but appreciate all advice offered.