For how long, is the question though? Depression and anxiety are like the "common cold" of mental health suffering, and everyone endures it a few times in their life.
Recurrence is about 50% for people with one major depressive disorder occurence, and 80% for people with 2.
That makes it more akin to something like cancer in western countries with regards to lifetime prevalence (but not recurrence)
The "mild or moderate" segment of depression, or anxiety, is what is said to be a more common short-term occurrence amongst all of us. Most of us manage to often deal with this kind of "situational" depression / anxiety due to some stressful event (losing a job, death, breakup etc.), on our own. But long-term and / or severe / extreme depression is what often requires an outside intervention.