Shaved back up to buzz; buzz down to shave; even rug/no rug/rug (shudder)--are all "sometime things," but a tattoo is (essentially) forever.
Tattoo in haste; repent at leisure.
But when it comes to body modifications, I'm conservative. Took me to age sixty to get my earring.
Maybe when I'm eighty I'll get a tat. Less time left to keep saying, "WHAT a mistake that was."
Just sayin'.