The melody of What’s My Age Again? by Blink-182 runs 307 notes across 18 bars, 2:30 long in Bb at 72 beats per minute. The tab sits almost entirely in the first two frets, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? What’s My Age Again? chords and lyrics.