Stop feeling bad about missing peoples' birthdays and instead take charge with a birthday book, also known as a perpetual calendar. That's what I did in 1997 when I bought the fabulous Good Grief! Some Dates Are Hard to Remember Special Occasion Datebook. The illustrations are based on the PEANUTS comic strip by Charles M. Schulz.The book is spiral-bound and divided by tabs into the 12 months of the year. Each day of the year has half a dozen lines for you to record anniversaries, birthdays, and other occasions which celebrate the lives of the people you love and care about. A few days before the start of each month, I review whose birthday or anniversary is coming up. I pull together greeting cards and get to work. It's easier to just send them out in a batch.
I dedicate the single drawer of my desk to my birthday book, stamps, return address labels, stickers, and stationery. So sending notes to people on any occasion is fun and easy. It's so satisfying to hand a stack of crisp white envelopes to the mail carrier.
Most book stores and stationery stores carry perpetual calendars. Another good source is calendars.com.
Go to it! Go get a birthday book!