I had an American standard boiler, oil converted to gas from 1946. I replaced it in 2021, it still worked great but the pilot broke and they dont make it anymore. I probably could’ve found one that “worked” and fixed the system but I priced out a new one at $13k. So you’re might have some solid life left in it.

A huge benefit of upgrading is the new one brought my gas price from $600 down to $250/month in the winter. So taking in the 7 months I use it a year it’s take about 6 years to pay for itself. It also requires less maintenance (we have radiators and it self regulates the water intake and drainage).