@bellshade if you are around 40, that means she's around 23 years old. I want to tell you to go for it. It can work and it has worked for others.
Remember that you're still strong, infact you're just ripe in many areas.
Don't brag this to her about this though 
:
- you're mature
- you're more patient than many younger men
- you're settled
- you have experience
- you're done with excitement of the youth