It really depends what sport, cycling is not that hard to pick up later in life, it just comes down to power.
There is zero chance a keen 20 year old goes to play in the NHL for Ice Hockey having played only in winters in US or Canada or Russia. We played against Canadian kids that grew up on ice skates and that could dribble a puck at age 4. If you are not in academy at 16 you are not playing NHL. There is just no catching up.
If you an endurance athlete, you can easily switch from running, riding, cross country ski, etc.