archlinux how old is your installation
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on archlinux, to see when you installed arch on your computer, run this command
sed -n "/ installed $1/{s/].*/]/p;q}" /var/log/pacman.log
it will display the date and the time when you ran pacstrap on the live cd to install your system.
on my laptop, i get [2018-10-21 21:05], which is when i switched from fedora back to arch because my school required fedora.