The beloved ‘M*A*S*H’ star was diagnosed with Parkinson’s in 2015

At 89, Alan Alda is as quick-witted as ever. Just ask him how he’s doing.

“Making progress,” he tells PEOPLE with a sly smile over a recent Zoom call. He pauses before adding, “I didn’t say in which direction.”

Since being diagnosed with Parkinson’s disease in 2015, the beloved M*A*S*H star and father of three — who also has face blindness, or prosopagnosia, which makes it difficult for him to recognize people — says life has been a never-ending series of puzzles.

Read more at People: Alan Alda, 89, Says Managing His Parkinson’s Is ‘Almost a Full-Time Job’ But ‘Keeps Me Looking for the Funny’