What Causes Extreme Fatigue And Exhaustion After Sleeping?

I m a 47 year old female and starting to feel fatigued after work, almost daily. I am a secretary, so I sit for long periods of time, but I do get up and move around the while putting supplies away or helping a co-worker. I don t know my family medical history due to being adopted. When I say fatigued, I mean extremely tired, achy, no energy and even though I sleep for about 7 hours every night, it never seems like enough sleep. Is this simply a matter of me getting older??