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.
Dependable Carrier products are among the longest lasting heating and cooling products available. The average air conditioner lasts 12-15 years, while a gas furnace can last 20-25 years. There are many variables that affect the life expectancy of your specific equipment, including the frequency of routine maintenance.