Brett Favre, the aging 40-year-old quarterback of the Minnesota Vikings football team, proved to the rest of us Sunday that getting older doesn’t mean you’re losing it. To the contrary, demonstrating that novelist Thomas Wolfe was wrong in his belief that you can’t go home again, the supposedly washed-up quarterback hurled four touchdowns to lead the Vikings to an impressive win over his former team, the Green Bay Packers. It reminded me of another old geezer, Richard Russell, the 85-year-old editor of Dow Theory Letters, a well-regarded investment newsletter out of La Jolla, Ca., and a recent critically acclaimed film, No Country for Old Men .