Young or old? Rock music: Young is better. Classical music: Old is okay. Software business: Young is better. Manufacturing business: Old is okay. Mathemati

Young or old? Rock music: Young is better. Classical music: Old is okay. Software business: Young is better. Manufacturing business: Old is okay. Mathematics: Young is better. Literature: Old is okay (actually, better). Chess: Young is better. (I could probably beat Fischer by now.) Contract bridge: Old is okay. (Don't laugh--Gates and Buffett play). Revolutionary conflict: Young is better. Invading Russia: Old is okay.