Hello LaDauphine: Well... a couple of things here. First, as gayleggg mentioned, the current thinking at least with regard to depression is that it is a neurochemical imbalance in the brain. So it isn't simply a matter of what's going on around you & how you respond to it.

The other thing (at least as I have come to understand it) is that, over time, pathways get worn into the brain. Our mental processes tend to keep travelling down those same old pathways... sort-of like cars that can't get out of a rut in the street. So, as a result, even though circumstances may have changed dramaatically for the better for you, it's going to take time, & perhaps effort, for you to "reprogram" your brain, so to speak.

There is one other concept I have run across that may be relevant here. Current neuroscience research is showing much more of who we are, & what we do, is controlled by areas of our brains to which we have no conscious access than we would typically imagine. So while consciously you know that your circumstances have changed dramatically for the better, non-conscious areas of your brain may still be telling you that things are bad.

So how does one address this? Well... the passage of time itself may help. And, of course, there's therapy (I'm sure you knew that...), meditation, physical exercise, you know the drill... A new goal & / or a new hobby might help too, anything that you can do that can help to build new feelings of positivity where once there was sorrow. Yes, I suppose there could be something of a " mid-life crisis" brewing here as well. (I guess I still kind-of remember what one of those was like!) That could be at the root of why you feel you're not aging well. However, even if there is an element of mid-life crisis at play here, I think the remedies are probably the same. I wish you well...