You won't necessarily have the same tastes and interests later in life as you do now, just as you didn't before you got to the age you are currently. That being the case, if you hold off waiting to find some magic, timeless, classic tattoo that will remain meaningful and appealing to you for the duration of your life then you'll never get one. Too many people seem to think that their tattoos need to be somehow meaningful or "deep", but at the end of the day it's body decoration, so if you like it get it, if you can't find or design any nthat you like enough to get them permanently etched then don't.