Thirty is not middle aged
“Thirty is not middle aged”
So true. Middle age starts around 45.
They may be referring to the old hippie slogan "Don't trust anybody over 30", meaning they're no longer young, and have started into middle-age.
Being a very active, rock-n-roll-playing 65-yo myself, I looked at 40 as the beginning of middle age, and as far as I'm concerned, my "middle age" will continue until I damn well decide it's over. Maybe around 80, God willing and the creek don't rise.