Cant comment on how durable the house is. That will require a professional inspection. Sometimes, if you have any uncertainties, it may be wise to hire your own home inspector to provide you a detailed report. This way you are less likely to have any surprises when a prospective buyer hires their inspector. Your house may be just fine or it may be a disaster. It IS 100 years old.
Two things I have done that you may find useful
I interviewd the head of ASHI here
Episode #32 - America’s top Home Inspector
I have also created an annual DIY home inspection checklist here
Episode #57 - Springtime House Inspection
Do your own walk through with the checklist. You may find some things that can easily be remedied. Then hire a home inspector.