"I am an adult"
-boring
-common
-reveals that you pay taxes

"I am a former baby"
-shows growth
-could spruce up your resume
-squashes any suspicion that you were not once a baby

@lowqualityfacts
"I -was- an adult"

- technically correct, the best kind of correct
- darkly mysterious; you were, but what are you now? Still an adult? Some unholy state that cannot be written?