Advice please: my dad is having a mid life crises

My dad is 52, and is currently having a mid life crises. Despite being successful and owning multiple businesses, he is now finding himself jumping from job to job, a lack of friends and no family to live with and in his own words he is "worthless"

Because of this he is now finding love in Thailand and wants to move over there to live with his online girlfriend! He won't listen to logic. He wants to run away from everything and believes his life hasn't been worth it and he will die in 20 years apparently.

I've tried everything to help him during this time but nothing is working for me.

Please, what did you find helped you through this in your life. I am scared for my father, he is legitimately moving to Thailand because apparently the woman over there want him and no one in Australia does..