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.
Air source heat pumps can be expected to achieve 12-18 years while A/C units may last 15-20 years. Ground source heat pumps should achieve an 18-25 year life. Gas and oil furnaces will likely have life expectancies of 15-25 years. Boilers may range from 15 years to well over 30 plus years. The area the units are installed (basements, craw space, attic, etc) will play a factor as well as the demand and usage placed on the equipment. The most important aspect to long life is the quality of the initial installation of the equipment. more.