Psalm 72

This psalm is attributed to king David and noted for Solomon. I wonder if these are some of the last written words of the aged king? I wonder if these words were indeed the last of his psalms. Did he strum out the tune on his trusty lyre or did he hum to tune to the royal musicians and let them further develop the melody and harmony?  There are many, many question I have about the reason for this psalm but I still see the trademark reliance on David in these words. At it is good to see that even in his later years the king still knew the value of dependence on God for the future.
Stuart