If you're having a midlife crisis, that is exactly when you should not do anything permanent, like getting a tattoo. You know it is a time you are not thinking clearly.
And if you must, get it somewhere not obvious, and get a small one. Less to regret.
Anyway, what the heck is a tattoo going to do that will help you in any way?
Why, it will make me feel younger, of course! And then I won't die!