You start with 2048 single people, and have to act as matchmaker to pair them off into married couples who each produce at least one child. A generation later, you take the 1024 first-borns of each couple and have to pair them off too, into 512 new pairings.

Repeat that long process until there is just one couple left, whose first-born you then propose to. Having lived long and healthily enough to complete this game, you must have some very desirable genes and/or wealth, and you'll be good friends with basically all this person's ancestors, so there's a strong chance they'll say yes, despite the age difference.