"He's going to be around a long, long time, if his body holds up. That's always a concern with a lot of players because of how much they play. A lot of guys can't handle it. But it looks like he can"

Jack Nicklaus is describing a gamer who has actually been betting a long time and is likely to continue to do so. He is suggesting that the player's body has the ability to deal with the rigors of the video game, which is not the case for many gamers. He indicates that the player has the ability to stand up to the physical demands of the video game, which is a testament to his strength and endurance. Nicklaus is likewise suggesting that numerous players are unable to handle the physical demands of the video game, which is why it is very important to have a gamer who can. He is praising the player for his capability to stay in the game for a very long time, and is recommending that he will continue to do so if his body holds up.