I have two pigs with a wide age gap (Sundae is over 5.5 years now, Hadley turned one not long ago.) Hadley still wants to run around like a maniac and Sundae wants to lay down and snooze. Every night during free time, I put down snacks for them in the hallway. Sundae usually eats, sniffs around a bit, and then goes back in the cage. Hadley eats, then runs around in circles and keeps trying to entice Sundae to do the same. She will run around, then goes up the ramp and peers in at Sundae and sometimes will squeak at her. She is plainly trying to get Sundae to 'play' with her. Sundae is not having it at all! I feel kind of bad for Hadley... I really never wanted to have a big age gap like this. It just unfortunately worked out that way.