Washington, D.C. ? Sen. Tim Johnson turned 60 on Thursday, two weeks after emergency surgery to repair a brain hemorrhage that has left him in critical condition.

Julianne Fisher, a spokeswoman for the South Dakota Democrat, said Johnson won’t be present in the first days of the new Congress next week but is continuing to improve. She said he is responsive to directions from his wife but has not yet spoken.

It’s too early to tell how long recovery will take, Fisher said.

In a statement Thursday, Johnson’s doctors said he remains in intensive care at George Washington University Hospital.

Dr. Vivek Deshmukh, head of Johnson’s surgical team, said in a statement that the senator’s overall condition has improved and he is gradually being weaned off sedation to help his brain heal.