If you are part of a religion that very strongly insists that you believe then to decide not to do that is quite a big hurdle to jump over. You never forget the thought process you went through. It becomes part of your whole intellectual picture.
The best anti-aging advice I've ever received? Drink a lot of water and have a plant-based diet. I also do mindful meditation with my daughter every day. It takes ten minutes. I think reducing stress plays a big part in anti-aging.