A, Your xh husband is attempting to burn the candle at both ends w/ow. Stress and guilt can do that to a person and the mlcers do age quite a bit as they move forward on their path for illusive happiness.
As for the ow in the photos, he is trying to promote her has his soulmate and wants everyone to see her and know that she is w/him. He's trying to convince the world he is one happy duckling and she's the greatest thing since apple pie.
My xh has done the same thing out on facebook...but I have to laugh these days...the new wifey (ow) has now dyed her hair the exact same color as mine, purchased eyewear exactly like I wear and also has cut her hair in a style that I wore back in the late 70's/early 80's.
I do believe that they know that we check on them periodically and are determined to ensure that we see the ow as their soulmates. Mine xh is just as stupid as can be and posts where he lives, telephone numbers and where he is at all day long w/tweets. The wifey doesn't do it, i.e., just as your xh's ow doesn't say much on the alt. It's the mlcers that want to prove to the world that all is right and they made the right decisions to leave us. Quite frankly, time has not been kind to them and they don't even realize it.
I believe your xh is still in replay and could very well be stuck there for a while. It is very abnormal what they are doing w/the photos for men their age, but stop and consider...they are teenagers and this is exactly what teenagers do when they think they are "in love".
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.