You could also go to a neurologist and have some tests run -- beyond general aging and its impacts on memory and reasoning there are other types of issues that

You could also go to a neurologist and have some tests run -- beyond general aging and its impacts on memory and reasoning there are other types of issues that can impact people much younger than expected. That said, if you do not exercise you should really try for a few weeks. Where your body may have been able to coast with normal effort in the past as you get older you need to give it more focused work to get the same level of outcome. Beyond being good for your health exercise is known to have huge impacts on both mental state and acuity.