What advice do you have for someone who feels they've missed their chance to enjoy life at 39?

The new boycotts & divestment of Israel appear useless because Israel’s economy keeps growing from strength to strength, with or without the boycott. Sensitive question, does it enrage you that while you’re condemning Israel, God is still with them?
Why did Stalin's plan to promote Vasili to higher positions backfire, leading to his downfall instead of preparing him for leadership?