@Adam Kuszczak most major metro cities will follow the same pattern...the "inner city" will be largely original housing stock...late 1800s to mid 1900's...developments typical radiate from the city center with age...so, 1950's through 1980's built properties are usually 3-5 miles from city center with the newest concentration of properties outside of interstate bypasses (usually forming a circle or partial circle around metro areas)...there is infill building and exceptions to these rules, but property age will be your #1 determining factor of where the properties you are targeting will be located.
Building materials and methods of construction (along with codes) were very different from one decade to the next, but homes are surprisingly sturdy and most anything can be fixed. I would set a year built filter with your other criteria and see what it returns...remove the filter and see if the properties showing are something you can be comfortable with.
It's more important to focus on the location and configuration of the property and opportunity for value add than focusing on year built.
That said, older properties (if not updated) will always require more work to get stable due to inherent issues associated with the building style and materials...stone foundation, slate roof, balloon framing, ungrounded or unsafe electric, and possible abatement of hazardous materials...
