David was anointed by the prophet Samuel as a young teenager, likely between the ages of 10 and 15, as recorded in 1 Samuel 16. He became king at the age of 30, as stated in 2 Samuel 5:4. Therefore, approximately 15 to 20 years elapsed between his anointing and his ascension to the throne. During this period, David experienced significant trials and growth. He served in King Saul's court, became a renowned warrior, and spent years fleeing from Saul's attempts to kill him. These experiences prepared him for his future role as king. David's journey from anointing to kingship exemplifies the importance of patience and faith in the fulfilment of God's promises.