If you have not already chosen a tattoo, what about something like:
Qui multas bonas memoria comprehendo, tandem mori possum.
I, who hold many good memories, at last am able die.
You can make a nice, stylistic tattoo out of it. It's not pithy, though, if that's what you're going for.
Note that this is a sentiment at the end of one's life. It's reflective. It's not an exhortation to live one's life to the fullest, which to my ears reads a bit farcical. I know I've seen it before, but it really is quite something if you think about it. We're commanding someone to die?
The Romans though didn't typically use memoria to mean a recollection of a specific event, but rather one's recollection in general. The former is more common in English, but rare in Latin.
That's why I changed it to multas bonas, but perhaps something more specific can be substituted instead.