Job Satisfaction

This sounds all too familiar. I think it may be age related (I'm 48), and I have kind of just been looking around and thinking "is this all that there is?" That sounds a bit more depressed than I actually feel, but it's along those lines. I actually like my job... but I've been doing it for over 25 years. I have no desire to go up to senior management, but I also dislike the way they run the business - so it's a bit of a conflict. When I was younger, I had more energy, but I was also risk averse and knew that if I just did competent technical work, through the miracle of compounding I could have a fair amount of money by my 50's. And I was right... but then I never tried to do any of my more interesting ideas. Now, I've been able to pay off my house and fund my kids college education -- but I'm kind of just too tired to try anything. Hopefully I'll pull out of it... because I've still got like 20+ years of working life if I choose, so I could still do some interesting things... but inertia is a birch to overcome.