I think it's happened to me a couple of times. Your sternum (or breastbone for others) is connected to your ribs by cartilage. It makes since for people around those ages because your shoulders are widening as you mature, and stretching it out with those activities may move it some.
Blue '04 Redline Best ET Gas:email@example.com, E85:13.94 @ 109.17
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289 WHP/262 WTQ on E85
K&N CAI, HP Tuned, zzp heat exchanger, 2.8, 80's, zzp header/dp, GMPP clutch, front and rear TTR mounts, Nitto Neogens, Hawk Pads, irotor cross drilled/slotted rotors.
Boost gauge/ladder tach w/o amishland- courtesy Spike50002