Am I too old for the ending?

38 and concur with both of you although I did not want Sara with Jack. Imo that we would be going backwards for her. It was a mistake that she "took up" with him in the first place. This was one awkward affair that I've ever seen. Sara tells Jack she loves him on more than one occasion but he never reciprocates except in a text message...strange that he couldn't vocalize that like a man who feels that she makes him want to connect????? SMH. So that emotionally upsets Sara to where she's emptying all of her bodily fluids. The trio here, Drew, Sara and Jack do not remove their wedding rings. Sara is still in love with her husband but felt reborn when she met Jack-"I can see more clearly, I'm sleeping better." Drew even notices the change with her-"You seem good lately, happy."

Jack felt a spark that he's never felt before with Sara as he told her in the pilot over a glass of wine but he tells her he's known Elaine for twenty years, she gets his jokes, she knows everything about him and yes he loves her but not the way he did in the beginning. This was an infatuation affair between J/S, not an affair where respective spouses make the break and divorce but are rather just content on staying married and playing house with their lover??????

I respected Drew and Sara for the way they handled it for the sake of their child BUT I wanted to see more from Sara in the form of an apology. It was obvious she still loved Drew but not the in the same way when she married him and Drew still loved her. Elaine was the only one I saw who showed any emotion. She yelled, she cried and threw Jack out of the house with shame and embarrassment and his tail between his legs then told him this was not his house anymore when he came back for the birthday party.

Now Elaine in less than a month, if the episodes chronicle the time line from episode #1 to #13, sleeps with and starts a relationship with a restaurant vendor AND exposes her kid(s) to it?????? Elaine and Jack totally missed what was going on with their son and imo they failed him miserably with their selfish decisions.

I believe the dialogue and how the scenes played out in the finale supported Sara and Drew staying together.

Ever hear what Leno said about the end of The Sopranos?
"The writers said they wanted to leave it up to our imaginations. If I wanted to use my imagination, I wouldn't be watching TV."

How can you classify Sara as a serial cheater? She cheated once and with one person? Lst time I knew serial meant occuring many times. If it's someone other than Drew or Jack how is that cheating if she's divorced and not with Jack?

YES!!! that was absolutely my take as well.