watch your terminology! . . . you don't exit AFTER 180 days, because then you will already be in "overstay"! You need to exit BEFORE your 180-days stay permit expires
just give them your INTENDED flight dates in the E-visa application. Only if the embassy asks your for further documentation and a REAL ticket, you need to act. . .the E-visa site only asks for your plans, not for already booked tickets
actually, an "onwardticket" is just a reservation for a booking. It is not a reservation for a flight ticket. Most of these reservations are only valid between 24 and 48 hours
the requirements and the health insurance coverage minimum are CLEARLY described on the list of visa-types that can be found on Thai embassy websites worldwide. For the Non-Imm-O/A Longstay Visa, the following is required:
you don't have to be retired to apply for the Non-Imm-O/A Longstay Visa . . . actually, "retirement visa" can mean SEVEN (7!) different visas or stay permits. When people say "retirement visa" you never know WHICH ONE of the 7 possible visa-types or stay permits they are talking about . . . here, the official "Longstay-Visa O/A" (e-visa list of visa-types)
the Non-Imm-O/A visa officially is NOT a "retirement visa". The Non-Imm-O/A Visa is a "Longstay Visa". The only true "retirement visa" is the 90-days single entry Retirement Visa