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Conventional wisdom is that athletes decline with age, peaking in their teens or 20s depending on the sport — but tennis superstar Serena Williams has a bone to pick with that idea.

The 34-year-old insists she's actually a better player now than she was in her 20s, and she has the wins to prove it.

'Who says that your thirties is when you’re supposed to be done? I would like to know who made that rule!' she said in a new interview with Glamour. '[My mom said], “In your thirties you’re even stronger than in your twenties.” I didn’t believe her, but I have played better in my thirties. And I played pretty well in my twenties, don’t get me wrong! But my consistency is better, my momentum is better, my wins are quicker.'