Prime Minister Narendra Modi wished Lal Thanhawla on the occasion.
"Wishing the Chief Minister of Mizoram, Lal Thanhawla on his birthday. I pray that he leads a long and healthy life," Modi tweeted.
The chief minister has been bed-ridden for the last two days and is being treated at his official residence, they said, adding that he is out of danger.
Lal Thanhawla is five-time chief minister of the state.