Three things determine value. Location, Condition, and price. Location is the most important, because you can't change it. The other two can be changed. Condition will bring higher offers, and quicker sales. Price is the easiest to change. Anything will sell if priced below market.
If you are thinking of selling in the next year, use caution. Sales the last 4 years have been slow. I question if you can get back a dollar for a dollar spent.
And remember, a good cleaning, fresh paint and a little landscaping go a long way.
In my opinion, It's not so much the age of the house as bringing it up to neighborhood standards.