From the opening song to the TV series Jackie und Jill — Die Bärenkinder vom Berg Tarak:
Ja so ein Leben,
wünscht man sich eben,
ist man noch klein.
The full lyrics (which can be found in written form here) speak of bear cubs anxious to grow up finally to be able to do all sorts of fun things.
I understand the individual words (not very confident about the "ja so", though), but struggle to make out what the lines mean in combination — in particular, how "ein Leben" relates to the lines (or just one of them?) below it, and how do they fit together while seeming like two separate sentences, each with its own declined verb.
My best guess is that the passage means something along the lines of
And for a lifetime (=what feels like a really long time) that's what you're stuck just wishing for, still being small
but I'm really unsure about it.