Example cron task for auto-removing old downloads on macOS Big Sur and Catalina

crontab.txt

# Cron on macOS 10.14+ requires Full Disk Access permissions in 
# System Preferences->Security & Privacy. 
# More here: https://apple.stackexchange.com/a/372810/42898

# Removes downloads older than 14 days. Runs every 6 hours
45	*/6	* 	* 	* 	find ~/Downloads -maxdepth 1 -mtime +14 -exec rm -rf {} \; >> /tmp/cron.log 2>&1