or, you could apply for the education visa after landing, and then you can apply for retirement in country without leaving. I'm 50 and just did this research for myself. Education visa is the only visa that can switch to retirement without leaving.
you don't need an exit ticket to enter but you will have to leave the country to apply for retirement. Use your stay to find a visa agent and try to set up a bank account with your agent. Plan to leave to formally apply. You'll have to do extentions and border hopping until it's approved.