General real-life applications for the Stroop effect include advertisem*nts and presentations--people who make billboard or magazine ads have to be very careful about the color and font their text is printed in, for example, due to effects like the Stroop effect.
However, you went one step further (good for you! what did you find?) and tested how this effect changes with age. This might affect how advertisers targeted ads to a certain age group. You could also potentially be measuring one of two things--how 'interference' increases with age/changes with age group, or how information processing in general slows with age. I am not sure what sort of tests people do for mental problems like dementia, but you might consider looking that up.
Good luck!
