I figured that once I got past 40, that was all behind me. If I knew that I was going to live this long, I'd have taken better care of myself.
Source, in full
After being treated for a bleeding ulcer, regarding the false sense of security stemming from never having contracted the Hodgkins Disease that killed his father before the age of 40; as quoted in "Schedule Blamed for Mantle Illness" by UPI, in The Los Angeles Times (June 25, 1978)