I Am 67 Years Old Male And Is Having No

I am 67 years old male and is having no problems. I am leading very active life and go for around 1-2 hours walk in the morning. About 6 months back I got my BP checked and it was found to be very high i.e.170/90. On rechecking 2nd day with another doctor the BP was almost same. My doctor prescribed me Natrilix SR and KLEIST 10 (Celnidipine 10 mg). Both the tablets to be taken daily with breakfast. Gradually my bp had come down to 112/67 with the above tablets. Without consulting my doctor I have reduced the dose of both the tablets to half since about 2 months and my bp is still under control to the level of 120/75 app. Kindly advice whether I should continue with the reduced dosage. I have no other problem.