It's too late for me, I'm already divorced and pay alimony, but I'm curious what I could tell my adult children about this topic.

Since men appear more likely to marry down, how do you protect your assets and not lose them upon divorce. Say you have a ROTH IRA with 100K before getting married, but it grows over 20 years, how do you keep this growth protected.

What are some ways you can maintain/separate/hide your own assets, while having them grow, but also keep them after a divorce?