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.
Typical Life of a Furnace. The 27.5 year life that the IRS assigns to a furnace when it's installed in a residential rental property is relatively close to how long the average heating system lasts. A gas furnace should last 15 to 25 years, while a heat exchanger is good for 15 to 30 years and an oil furnace is good for 20 to 30 years.