I'm only 83 years old. I use Linux debian sid, regularly updated with the smxi script. Where security is an issue, my passwords are at least 12 characters long, with a mix of numbers, upper case, lower case, punctuation marks etc. My passwords contain no word, or part of a word. My e-mail is encrypted and I use an encrypted search engine. I have phishing and malware protection and avoid opening hypertext links and attachments, unless I'm happy about their origin. I have tor installed and use it, occasionally. Nobody has ever gained administrator privileges in my computers in 15 years of using Linux.
I relinquished my seniority when I retired, but I hope internet security doesn't become too arduous a problem for me, if I ever become Senior again!