TSA has really reduced the number of people that "randomly" get selected for Pre-Check and there is no automatic inclusion in Pre-Check after a certain age so if you want it, you'll need to apply for it. As @dfwskier points out, there are different screening processes available to people 75+, these are sometimes referred to as "Pre-Check lite", but actual Pre-Check is almost always a much better experience. Here's the link to get more info about applying for Pre-Check: https://www.tsa.gov/precheck --TheMiddleSeat
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