You’re never too old to celebrate birthday! Even the Queen writes a special happy birthday note to people who celebrate their 100th birthday and that’s really wonderful. Any reason, however small, to celebrate, should be celebrated!
I still remember the first time I celebrated Christmas. I was 21 years old. In my hometown, only Christians celebrate Christmas and because my family is not, we don’t celebrate. My first Christmas felt like magic and I’ve celebrated Christmas ever since, even if it’s just in a small way.
Keep celebrating because every occasion that brings joy is worth a celebration :)