What tattoo symbolizes growing up?
i am not sure what you mean? Most tattoos symbolize whatever you want them to. I have only on tattoo and it is a butterfly, its black and on my right shoulder. Butterfly, i got it the first day that i moved out of my parents house,(spreading my wings) Black for simpleness, and plus its cute. Choose a tattoo that means something to you...or that doesn't and make it mean something. tattoos are something that are yours and something that you keep forever. make them tell a story....your story.
You can't forget your past. But I guess you mean 'what tattoo symbolizes moving on?'. Just choose whatever tattoo you want. Because if you have moved on then why are you allowing your past to influence your tattoo choice? :) If you wanted to move on from an ex-partner would you keep a picture of them in your pocket? No, you would go out and have a good time doing whatever you wanted. ;)