The boss was born on September 24, 1962 and enjoyed a family occasion last night to mark his milestone birthday which was made all the sweeter after the 4-1 victory.
He was presented with a special cake after the game yesterday in his matchday office at Ibrox as you can see from our exclusive photograph.
Fans celebrated the occasion just before kick-off by unfurling a special banner.
McCoist is quite simply a Rangers legend after 15 incredible years as a player, four and a half as assistant to Water Smith and now 15 months as manager.
You can read a full profile on Ally the player HERE.
One man who knows him better than most is long-time friend Ian Durrant who has been so through many triumphs with him and also endured darker days.
He said: “He has been an absolute rock for the club. He was having to deal with so many things that are normally out-with the realms of a football manager.
“But he is made of strong stuff and it has been character-building for him. I think it has only made him more determined to take this club back to the top.
“We have a friendship forged for life. We are involved in a job that we totally love. We are dyed in the wool Rangers fans and hopefully with the right backing we can build this great institution back up to where it belongs.”
Assistant boss Kenny McDowall said: “Anyone that knows Ally will know that he is a very determined character and, above everything else, he is a winner, in fact he’s one of the fiercest competitors I have ever come across.
“Whether it’s playing golf, table tennis or having a kickabout at Murray Park he wants to win and his attitude to management is the same.
“Ally is desperate to bring success back to Rangers and to get the club back where it belongs.”
Skipper Lee McCulloch said: “He has a great personality but he is also a strong character, something you need to have at a club the size of Rangers.
“You don’t score the number of goals and win the amount of medals Ally did as a player without having a constant desire to be successful. He certainly had that as a player and, having worked with him for a number of years now, I know he still has that hunger as a manager.
“It’s great to be working with him and on behalf of all the players I would like to wish him all the best for his 50th.”