More birthday wishes from me, Abbeygran. Sorry ds forgot your birthday twice in a row. He may still be adjusting to his divorce, but I know his forgetting was still disappointing.
When you say your dd called, do you mean to wish you Happy Birthday? If so, then, in my view, she didn't forget, she just handled it a different way than you expected. I know people who always call on birthdays instead of sending a card and have a friend who actually prefers that. As long as she acknowledged your birthday, I think she did ok.
Someone mentioned social media. Are you friends with your ac on fb? I know either you or they might not want that. But people often post birthday greetings to each other there, and that may be what ds is used to now. Also, one can list their birthday on fb (just the month and day if one prefers), and then one's fb friends get reminders and often post birthday wishes. You'd probably rather they remember on their own. But some people just don't. So fb might be a solution if you're not on there already. Worth thinking about, imo.