How often to stretch for better mobility, less pain and healthier again

Unless you regularly practice yoga or make it a point to include lunges or butterflies as part of your usual routine, you might not be stretching much on a day-to-day basis. For many people, stretching is reserved for specific moments, like before a workout or when muscles feel especially tight. But is it wise to stretch so infrequently, especially as aging naturally reduces mobility and flexibility? And which stretches are actually worth doing?