Written By Regina Brett, 90 years old She is published in The Plain Dealer, Cleveland , Ohio "To celebrate growing older, I once wrote the 45 lessons life taught me. It is the most-requested column I've ever written. My odometer rolled over to 90 in August, so here is the column once more:" 1. Life isn't fair, but it's still good. 2. When in doubt, just take the next small step. 3. Life is too short to waste time hating anyone.. 4. Your job won't take care of you when you are sick. Your friends and parents will. Stay in touch. 5. Pay off your credit cards every month. 6. You don't have to win every argument. Agree to disagree. 7. Cry with someone. It's more healing than crying alone. 8. It's OK to get angry wit