Are ticks and lice common

I believe so. I have never been bitten in all my 40 years. I am always outdoors in Wyoming and I find ticks crawling on me all the time, but I have never had one in me. Just the other day I spent the night out in our deserts and a couple of days walking around the sagebrush hills. When I woke up the next morning and was changing my clothes, I found 6 ticks on me that I had slept with all night. I found one on the screen of my tent trying to get in. But not one tick on me. My father has never had a tick in him before either, and he is 64 years old. My 18 year old son has never had a tick in him. But all 3 of my daughters and my wife have all had multiple ticks.