[dspillett]

> Well what if those decades were your childhood?

Then you are starting with a massive disadvantage, there is no way to sugar coat it.

But unless you are properly knocking on death's door it is never too late to start improving things. It can be surprising how quickly you can make small change with a little determination, and how quickly small changes add up, and how much each small change can motivate the effort for the next, especially if you can avoid being completely derailed by the occasional set-backs (that will happen).

If your condition is as bad as it sounds then consult a trained medical person if you can rather than relying on tips from the Internet - they may be able to provide you with a plan specific to your needs that will jump start your progress safely (on the Internet you'll find many ways to jump start progress that may be unsafe either generally or specifically for someone in your current condition).