My practice routine at the age of 57 is more a matter of stretching than hitting balls or putting and chipping. I've been blessed with a pretty good, consistant short game and reasonable putting most of my life except for a couple years about 15 years ago when a neurological disorder, (now under control), had me hitting the ball everywhere.
When I warm before a round, I tend to find the flattest available spot on the practice green and drop three balls about 10' away. At first, I just want to get a feel for my stroke and get some idea of the speed of the greens that day. I'll smack a couple 20' - 30' putts for the variety, but at the very end, I'll go in to about 2' and try to make some repetitions to take some confidence onto the course with me. I might try some side hill putts too, but I'll always finish with the straightest putt I can for the confidence factor.