I've been on a keto diet since it was called Atkins Introduction (I never got over 20 carbs/day without gaining).

I'm 73. Last year I had my heart and circulation tested by a heart doctor. I have the heart and circulatory system of a 50 year old. I eat cheese and/or butter and meat almost every day.

So much for saturated fat being bad (for me at least - YMMV)

Bob