So the age of a home can be a factor but it can also have no bearing on the value of a property.
If I had to pick one factor that dictates value more than other, I would probably go with location. If you just look at anywhere in the Triangle and take two very similar homes that are let's say 10 miles from each other, one of them will defiantely be valued more. For example, values in Cary have been historically higher than values in Wendell, although new highways such as 540 and 64 have made access from Wendell to points west, .ie RDU & RTP, much easier so their values have risin over the past several years.
On the other side older homes come with challenges, their wiring and plumbing are older and often will need updating as they wear out. Windows, insulation, and mechanical systems are old and frequently inefficient t. Floor plans often aren't what the majority of today's buyers want and of course there can be lead, asbestos or other undesirable materials that were used in the past in the property. It's the rare older home that isn't going to require more maintenance than a new house.
Are they more valuable than a newer one, it's really a matter of opinion. Some folks love older homes, others like the idea more than the reality.
You know that old homes in Historic Oakwood area of Raleigh have a very high value. At the same time new home in a great location may be more attractive and valuable as well. It all depends on where it is, how well it is built and how much land it comes with, all these will make a difference in value.