How can I cope with my husband's mid life crisis?

MEN do not have MID-LIFE crises! They merely have a reduction in the hormone levels seen in their younger days, look out women you will also in the forty's or early fifty's. Forty years old doesn't mean squat! Your entire life is dependent on the maturity rate your body sets into motion at BIRTH. Perhaps a closer look into the communication level of your marriage will give you the insight as to why he "acts acts." Stop behaving like a "teeny-bopper," he may be wanting a more older wife!