Which laxative should I take for my constipation?

DEAR DOCTOR K: There are so many laxatives on the market. Which one should I take for my constipation?
DEAR READER: Anyone suffering from constipation should start by boosting fiber and fluid intake. That may do the trick, and you may not need a laxative. If you are age 50 years or younger, the target is 38 grams of fiber per day for men and 25 grams per day for women. For men and women over 50, aim for 30 and 21 grams per day, respectively.