I Am 61 And Pretty Healthy. About A Month Ago

I am 61 and pretty healthy. About a month ago I had a stent put in. One artery . Family history of heart disease dad diied at 37 heart attach sister at 40 and. Mom at 80. I'm now on do many medications I ant to change my lifestyle and md to start so replace. I'm a big exerciser and golfer. I feel with diet change and a strict work out regime t it would help. I weight 129 and I and 5 fort 4 1/2 inches. Any suggestions?