Surgery - Colorectal. In brief: Yes, most docs can. Most hemorrhoids should first be treated by conservative measures, such as bulking the stools, education to avoid bad habits like straining, sitting for long periods of time, etc.
Either system will have a burner. 23 years may very well be beyond the typical life expectancy of a oil burner, but a furnace or boiler should last considerably longer than 23 years. The boiler of my house here in MA is 58 years old and still works fine. I am starting to consider replacements, however.
A properly maintained and installed furnace can last 20 years while an air conditioner and heat pump can last around 16 years and 14 years, respectively (on average). As you can imagine, heating and cooling technology progresses immensely over such a long period of time.