Here are some tips for marriage, written by people who have been married over 50 years, that I received in an email from Family Life:
Solve a big problem a little at a time.
Consider each other's opinions before making decisions.
Remember, you are not the Holy Spirit.
Always be truthful with one another.
Forgive one another as Christ forgave you.
Don't dwell on past failures; count your blessings and look forward to the future.
Have fun together.
Marriage is a lifelong commitment.
Keep courting and encouraging one another.
Trust each other and trust the Lord.
Say, "I love you" every day.
Look for ways to help and encourage one another.
Live the Bible--don't just know it.
You can't speak everything you think.