Matt Payne Being a house flipper and owner of buy and hold rentals, I could say that your question is just way too broad to answer.
This varies greatly based on the area/ neighborhood/ city/ location. For instance, an older house in an up and coming gentrified downtown area could appreciate very fast.
However, in my buy and holds I try and buy things I can force equity into, which generally are houses built from the late 50's to late 80's. The real gems are usually 70's modern ranch style that need a lot of cosmetic remodeling, which are in clean suburban areas.