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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.linux.misc
Subject: How Long Since Last Kernel Update
Date: Tue, 14 Jan 2025 04:44:06 -0000 (UTC)
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    bc <<<"scale = 1; ($(date +%s) - $(stat -c%Y /vmlinuz)) / 86400"

Above shows days elapsed since the last kernel update, to tenths of a day. 
To change the precision, adjust the scale accordingly.