They're MCM sliding closet doors and were often used in cookie cutter ranch houses and mobile homes in the middle of the last century. In actual wood rather than solid core doors, they're likely expensive.

https://www.pinterest.com/pin/478155685424778220/

After you measure the door opening, height and width, you might totally rethink the covering for the opening.

The least expensive solution might well be inexpensive "drapes"/curtains hung on a rod above the opening. How much you spend on the curtains (or fabric if you're hemming it to make your own) would determine the cost.

https://www.walmart.com/ip/Fashion-Fabrics-Value-Apparel-Assorted/523706748?wmlspartner=wlpa&selectedSellerId=0&wl13=3485&&adid=22222222227000000000&wl0=&wl1=g&wl2=c&wl3=42423897272&wl4=pla-51320962143&wl5=9011011&wl6=&wl7=&wl8=&wl9=pla&wl10=8175035&wl11=local&wl12=523706748&veh=sem&gclid=CjwKCAiAksyNBhAPEiwAlDBeLJ6J3yHuBpQIjiQ7-1LY_kU81aFh9axHtJ9Q-R4Cy_6DaiC1Pp94LRoCiKwQAvD_BwE&gclsrc=aw.ds

Another idea, depending upon the total width of the closet, might be to use vertical blinds.

DIY inclined? With vertical boards where shades would meet, you might be able to use pull down shades.

If, however, you want actual doors, consider whether these doors are in good enough shape to be be reused if you added hinges to one side of at least two of them and rethink part of the closet space that would still be open.

What are the measurements of the opening and what does the part of the closet door behind the bedroom door look like -- does the closet extend the full width of the wall from the exterior wall to the wall of the entry door?

Found these:

https://www.homedepot.com/p/Impact-Plus-96-in-x-80-in-Smooth-Flush-Solid-Core-Espresso-MDF-Interior-Closet-Sliding-Door-with-Matching-Trim-SFE343-9680M/205493760?source=shoppingads&locale=en-US&pla&mtc=Shopping-VF-F_D29A-G-D29A-Multi-NA-Feed-PLA_LIA-NA-NA-MinorAppl_Special_Buys&cm_mmc=Shopping-VF-F_D29A-G-D29A-Multi-NA-Feed-PLA_LIA-NA-NA-MinorAppl_Special_Buys-71700000042813121-58700005464629311-92700067963002094&gclid=CjwKCAiAksyNBhAPEiwAlDBeLJZXBZz_T6ZkSVHtYqe74ojpD1v4m4l7jGow9rPGkXZLcc6rA4S9GRoCbmQQAvD_BwE&gclsrc=aw.ds

Are you DIY inclined:

Are you in the US and is there a Habitat for Humanity Restore Store near you? If so, see what you can find there in the way of a bargain.

Check out some You Tube vids to see if you can find DIY options you might like.

You might be able to make a folding room divider or hanging room divider work but if not attached to the wall, they'd be awkward.

https://www.google.com/search?q=folding+hanging+room+divider&client=firefox-b-1-d&channel=nus5&sxsrf=AOaemvJ8rOQ58SuymhjzXzoh_h7GMvEong:1639206104156&tbm=isch&source=iu&ictx=1&fir=JUO1bRFEHUSdLM%252CENyADLpss3CYzM%252C_%253BPQhecOSf4E5mqM%252CjD-yj9Gl1Sg7PM%252C_%253B-x3OkP_cv9Z0hM%252Cf7w9Cher1suC1M%252C_%253BR-3gu07i9RYdoM%252CA0XeGbSGjmvmsM%252C_%253BzoX1tszgYJGWQM%252CiacsNYZVnAm-zM%252C_%253BV1PhwFAKmsV9XM%252CRzTcsoz-n-mJkM%252C_%253BZ_Baqnubfb46fM%252CRzTcsoz-n-mJkM%252C_%253BQFp1ImwxWkECCM%252CqFq5w_K7Th2sPM%252C_%253BkOPAsbg_KvPDnM%252CGEJz2idOtlr7jM%252C_%253BhbHT0HUI_ebfjM%252CiqqsSM3nK8PBxM%252C_&vet=1&usg=AI4_-kQJ5B3VedgkKaw_zxORT5OW36bTQQ&sa=X&ved=2ahUKEwjNsrTMltv0AhVwrHIEHVW_C2gQ9QF6BAgGEAE#imgrc=JUO1bRFEHUSdLM

Not a pro. There may well be another name for these doors that I don't know but if you start with that as you search ... such as on pinterest ... you might find more information.

Triple bypass closet doors?

i dont think they look bad but such a pain to use. in that space you have few other options except a curtain.

Id paint them the wall color also. no need to draw attention. good luck with your new path!

Easiest solution is to paint them to match your wall color. Maybe add a full length mirror to center one with nice frame. ( Use trim molding to save money.) Those sliding doors do save floor space where having 3 swinging doors would conflict.

If the doors work and you're just wanting a change of look, I agree that painting them the same color as the walls is a good idea.

If they do not slide as intended ... if they get off their tracks ... then what you might do is take pictures of the doors and hardware with you and try to see if you can replace the hardware.

https://www.amazon.com/Sliding-Closet-Door-Hardware/s?k=Sliding+Closet+Door+Hardware

Paint them the same as the walls to make them an invisible as possible and if it was my space I would be looking at Ikea for Pax to fill that space with so much better storage but this is not your house so just paint,

Another vote for painting them the same as the wall. Same colour, same finish. Replacing them will just draw attention to them, and the room won't look any better. Save your budget for things that are more impactful.

I agree with others that this is essentially a non-issue as they are innocuous. Just paint them the same color as the wall so they blend in.

Once you get them organized properly they aren't difficult to use because you know what is behind each segment and you put items that aren't accessed frequently in the segment that is most troublesome.

I have double sliding doors in my closet which I replaced when I remodeled with new doors. I have seen some gorgeous "statement" versions but any upgrade from your current innocuous doors would be expensive. A higher end MCM home might have had walnut slab doors. I have seen "fancy" doors that have mullions or lamina or the current trend "black" type of mullions. Some of my neighbors with the same layout have the "slatted" style of sliding wood doors.

Mine are full mirrors with invisible hardware. It works for me because I have a high rise city view so having the view reflected in the wall of mirrors was a design choice. It is also extremely practical to have large floor to ceiling wall to wall mirrors. It doesn't make me think of a bad disco in the least :-)

Save your money, effort and add curtains. You could paint interior same color as room, or add cute wallpaper and they will provide much easier/convenient access.

May want to store doors, in case a future home owner would prefer.

Love the last idea from Maureen.

You could also consider removable wallpaper in a cheerful pattern for the doors or the doors plus the wall.