Can you guess which photo of these ageless celebrities is older?

Happy birthday, Gwen Stefani! On Oct. 3, the ultra-cool singer/designer/superwoman turns 46 – but the ageless star looks just as good as she did during the “Tragic Kingdom” days of No Doubt nearly 20 years ago.

In honour of Gwen’s birthday, we decided to round up 10 ageless stars who seem to have uncovered the fountain of youth. Scroll through the slideshow above and see if you can identify which photo of these stars is more recent.

All photos via Getty Images