Did you quit alcohol and notice the physical benefits?Have you thought about quitting but haven’t made the leap yet? What’s holding you back?
Same as anything - temptation and social norms come into play.
Sugar, alcohol, and the real killers in highly processed foods, appeal to base instincts.
Not sure why 40 is a magic number - possibly the way you are appealing to readership? Perhaps all and any of us need to look at the indicators as per the references in the piece.
Look, listen and feel the way you are rather than search for articles fitness over forty.