You sound very bitter and full of hate and resentment towards yourself, family and wife.
I've harbored 30 years of resentment towards my mother, rarely called her and told her those things. Finally I put those petty feelings aside realizing that my mother did the best job she was capable of doing working as a single mom pulling herself up the ranks of a company to put a little exta food on the table and break away from our "white trash" upbringing to live a better life.
I feel better pushing aside bitter resentment feelings.
You can date the younger, more attractive girl, just don't let your wife know. Better yet convince her that polygamy is good for the man and helps him live longer as mentioned in an earlier slashdot article. "But honey, I don't want you to live longer"