Yes of course no age limit

Thailand doesn't recognise common law marriage, you are either legally married or not. So if not married they wont see you as a dependent to would need your own visa if you are legally married then it depends on the retirement visa as Graham has already mentioned

You will be very lucky to get a visa in 5 working days ( they dont work weekends). You can obviously try? Your partner could possibly be questioned to see if he is a genuine tourist after spending recent time in thailand. If you are flying into pocket for example they are looking at checking people who have had 2 vusa exempt entries with extensions asking what their internery is, if they have return ticket, if they have accommodation to cover there trip etc. So if you dont want to chance it ( they could get in with no questions!!!) Get a fast track

@Umer *************

London has recently been taking typically 14-16 working days to approve visas

@Martyn **********

I agree I was just correcting the previous post

@John *****

the tdac was re introduced in electronic form over a year ago and is an arrival card nothing to do with visa s or permission to enter thailand. Everybody gets a receipt confirming your form has been received no guarantee at all to get an approved entry

@Stephen ****************

you can enter 60 days visa exempt then extend in country 30 days leave thailand and re enter for another 60 days visa exempt but now onky extend to 7 days so total is 157 days

Just apply for a tourist visa then you should be good to go

You need to decide where you are going to stay in thailand and then look to see what soft power (i assume you mean muay thai) providers who are registered and provide you with the appropriate approved course and paperwork to support your application. You will need to sign up and pay for the course before you will get the supporting documents to apply for your DTV. There is a forum that deals with DTV on Facebook so I would suggest you look out for it and join

You need to look for a muay thai gym where you want to stay that is accredited by the thai sports authority and are allowed to give you documents that prove you have enrolled on a course and it is accredited. These documents are then used for you application through your home country or country you are currently staying (cannot be inside thailand to apply for a DTV) through the thai e visa online system. The Visa can take up to 14-16 days.