Let's go for the obvious: sit down with them and talk about it! I am assuming that you are still acknowledging their birthdays with parties, cards and/or gifts. Ask them how they would feel if you stopped doing that. Tell them that they should save up a little money during the year in order to buy you something small that acknowledges your birthday. It's important to be able to give as well as to receive. Then, when they do manage to celebrate your next birthday, be sure to give them tons of positive feedback - no matter what they do for you, make a big deal out of it, get all excited and let them have the real pleasure of giving. That pleasure will make them want to do this more and more in the future.   Sarah Chana

Why don't you involve them in buying a group present for your spouse's birthday? Then your spouse can rally them together to buy a group present for your birthday. When you guys receive your presents, you should get so happy that the kids will look forward to doing this every year.

I have two teenagers as well.  The one thing I always stressed is that I never expected them to buy me anything for my birthday.  A Happy Birthday Mom is all that makes me happy but at times they wanted to do something so I encouraged them to make a cake or suprise me with dinner so I didn't have to cook.  I've found that sometimes my kids felt badly if they didn't have any money so I made sure they knew just by giving me the time of day was the best present I could ask for.  If you tell them what you are expecting and make it within their grasp you will be surprised what they will do.