https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/prostate-cancer-screening
The current recommendation is not to test PSA in men over 70, although this site announces that there is an update in progress. It has a number of sections (scroll down) on rationale, etc, for their determinations.
When I recently had a colonoscopy in Bangkok, they would only do so under general anesthesia since I'm near 80 years old. Not my preference.