Looks like more than 13 years although I'm interested in where you found that today (December 7th) is the birthday. Is that when version 1.0 was officially released?
Interesting thread. It doesn't matter whether there is one more or one less day to count. What matters is how the entire system has developed over the years.
And apart from B4A, we now have a functioning cross-platform development system with B4X. Is there actually a comparable product for this?
In this respect, you can only pay tribute to B4X, its strong community and, of course, Erel's perseverance over the years.