Hear you.... I'm 71 and was hit with similar news at 50. Your lucky in that there are so many options these days. Men in family are have horrible cardiac histories. I lost uncles very young and my Dad had 4 heart attacks with two open heart surgeries & passed with heart failure.
I switched to a vegetarian diet, vegan at times. Maxed out the statin dose keeping my total cholesterol under 150. It been as low as 80 and rarely over 120.
That said, at 68 I had a stent for a 90% right main block and have a 40% circumflex block, both from old sins I believe. Also at 70 had a TAVR for aortic stenosis. All easy 45 minute venous procedures & home the next day feeling better.
This said, you can't beat your genes forever, but you can fight them and delay, delay, delay.... Plus the heart treatment options are astonishing now. I spent all last summer hiking in the Rockies shortly after my TAVR at age 70 and have avoided any heart attacks. We are hiking the Canadian Maritimes all summer this year.
It not over for you by a long shot. Get great Docs & Fight the genes!