You just don't know what the chink in your personal armor is. Most people at least have dental and facial bone structure issues and it's so common as to be unseen because we think it's normal. You probably have that even though you are thin and "healthy." Some people experience the next crack in their health with obesity and metabolic syndrome issues. Elevated triglycerides showed up for me at age 19 and some level of obesity has always been with me. Others get cancer early on. Some may see nothing and live until old age with good health. That doesn't mean they couldn't have had even better health all those years.
Female, 5'3", 48, Starting weight: 163lbs. Current weight: 135.
Starting squat: 45lbs. Current squat: 145 x 4.