I did the Olay test on their website. I thought at my age of 45, I would need the Regenerist or even the Pro X. I have a lot of issues on my face with brown spots. I lived in Hawaii for 7 years and I've noticed brown age spots on my upper lids and brow. The test suggested the Definity line. WOW! I've been using this for about 2 months and I am STUNNED. ALL of my brown age spots have disappeared. I am also using the Definity eye cream and lotion and my face is so much brighter and all the age spots are gone. I have tried much more expensive lines and even Tri-Luna cream and Olay blows them out of the water. I'm a true believer and will stay with the Definity. Great stuff! The serum goes on so smoothly and has a nice scent.