The 60+ Legends divisions rules are extended from the base rules here:

7. The batting line-up will consist of a minimum of 12 batters to a maximum of 21. Each team is allowed up to 2 shared lines in the batting lineup provided at least 12 batting positions are indicated in the batting lineup. A shared line may be indicated in the initial batting lineup. For example, if the 3rd position in the batting lineup is to be shared then the batters will be indicated as 3A and 3B and can come to bat or run for each other providing they reach base when that turn comes up. A shared line may also occur when the batter reaches base and the team chooses to pitch run thereby creating a shared line. That runner MUST bat the next time that spot in the order occurs.
These batters cannot bat for anyone else in the batting order and are not part of the designated runner rule unless (one or the other) is that last out (batter that was the batted / forced out) must run if the player after him requested a runner if he reach based.

Shared Line is a spot in the batting order on which 2 players occupy. For the first 2 at bats each player on that shared line MUST each bat once- (after that it is Managers Choice) - Each player may run for the other once they reach any base.  “HOWEVER” if a batter beyond them positioned in the order reaches base and has been designated for a runner and the last out was on a shared line or another batter has requested a runner,  the request for a runner must go beyond the shared line /or any batter requesting a runner to the previous out!

A substitution to the batting order may be made. However, Once a player is removed from the batting order, he is not eligible to bat / pinch run again in that particular game! But they are eligible to play defensively which includes pitching) 

All possible participants for a game should be listed as extras on the line-up card.
Also all teams are allowed to have any player who has not batted and who is on the lineup card to be placed at the bottom of the batting lineup any time during the game - that player however cannot be dropped from that spot in the batting order to the finish of the game

11. A courtesy runner may be used. Batters requiring a courtesy runner must be designated prior to the game. The last out is to be the courtesy runner, unless he is also so designated, or is the catcher; go to the previous out. A limited number of designated batters (4) will be permitted.

18. The Legend Divisions 60+
Players must be 60 by Dec. 31 of the tournament year, Each team can have up to 4 players 57 by Dec 31 of the tournament year. One (and the same one throughout entire tournament) can pitch and all must be highlighted on your team roster when handed in. All underage Pitchers must be identified on Lineup Cards.