I like it too…I’ve always wondered if there are things we can sweat out that we can’t pee out. Urine is actually a pretty complicated fluid.
One weird but true medical observation: people in chronic renal failure look older than their stated age. When they get a renal transplant, they start looking considerably younger.
Conclusion: there is something in urine that makes us at least appear to age…something dialysis can’t get rid of. To my knowledge, nobody knows precisely why this happens.