One of the problems is that we more mature people have far more on/in our minds/brains than younger guys, who appear to learn more quickly and retain it. Not always true! Everyone learns at different rates, so if you take longer, don't worry. In 20 years time, if you still go wrong, it's time to change instrument. I'm being jocular! Keep at it, obviously, but a couple of hints - which have featured in other answers. Choose your practice times carefully, if you're tired after a day's work, it's not good. Try playing chord shapes by hammering-on. This makes your fingers all arrive together on the fingerboard. Granted, not easy, but effective practice. Change without looking. Try to move fingers as little as possible, as in don't wave them around between chords, and leave a finger on if you don't need to take it off. Finally, as always here, get a teacher, if only for a couple of lessons. A good, experienced one will have seen all your problems in others, and have solutions.