I just about remember my 30th not because of dementia (37 y/o now) but due to alcohol consumption.
Surprisngly my best birthday present from my wife (then g/f) was on my 30th and it was a trip to New york. Which for me was one of thoses places I always dreamed of going to and cannot wait to return to.
Best thing out of that trip was proposing to my wife at the ice rink in central park.