There is some debate about the date of Christ's death, so he may or may not have actually been 33 years old when he was executed, but it's still interesting.

Here's an article discussing the dating of crucifixion.

https://bethlehemstar.com/the-day-of-the-cross/dating-the-crucifixion/

Here's an interesting page that discusses the meaning of numbers in scripture.

https://www.biblestudy.org/bibleref/meaning-of-numbers-in-bible/33.html