Grunting Russian glamourpuss Maria Sharapova has, it feels, been around so long that if you didn't know her age off the top of your head you might guess that she was 25 or 26.
But you'd be wrong. She's 21.
The point is that Sharapova, who captured the world's attention by winning Wimbledon at the scary age of 17 in 2004, has withdrawn from the WTA Rogers Open with a shoulder injury which may prevent her from participating at the upcoming Olympics and the US Open in late August.
The same shoulder injury, it appears, that forced her (pictured) to withdraw from the relatively high-profile Miami Open in March and which impeded her shaky, faltering progress at the French Open.
The same shoulder injury which dogged her throughout 2007.
And the same shoulder injury - would it be unfair to ruminate? - which has prevented her from reflecting her position as the world's highest-paid female athlete out there where it matters on court.
That Sharapova is a fiery competitor who remains a class act is beyond question: she won the 2008 Australian Open through a characteristically potent blend of determination and skill.
Yet what the Groundhog Day withdrawal from yet another WTA tournament to prevent "aggravating" her shoulder injury further does do, is to cast real doubt over the longevity of her career.
Justine Henin quit at 25, Kim Clijsters much earlier than expected, and Sharapova herself vows to pack it all in by the time she is 30 when she hopes to be settled with "a nice husband and a few kids".
But the big question is: does she have another nine years left in her?