They look to be around 6-8 weeks. They could possibly be the new zealand breed, but that will also depend what country you are in.
If you are in the US or other country that has good quality pet supplies, go to a pet store or walmart sometimes has it, and get a bag of timothy hay and a bag of good quality plain rabbit food pellets(no seeds or colorful bits) that has alfalfa as the first ingredient. Or you can buy hay cheaper by the bale, at a farm store. You would want a bale of horse quality grass hay that has never been wet so it doesn't have mold in it(sour or musty smell, black or white spots). If you are in a country that doesn't have good pet supplies for rabbits, but you do have access to fresh long grass, you can feed your rabbit the fresh grass. You want the long grass and not the short new growth, as it's too rich and can upset their stomach. You would have to gather a lot of it as rabbits can eat a lot of food, and these are babies that are still growing. Basically they would need enough to last them all day and night, and you would need to continue to gather it fresh so it doesn't start to spoil.
If you can find out the exact brand and type of pellets they were being fed by your neighbor, then I would buy those if possible so that you can immediately begin feeding them a normal amount of the pellets right at the start. If you have to buy a different brand and type, then you will need to gradually introduce them to the diet over a week or two, by starting with a small amount like a tablespoon, and gradually increasing the amount each day. This is because rabbits have a very sensitive digestive system, and you have to give it time to adapt to a new food or you risk causing digestive upset(mushy poop, diarrhea, stops eating and pooping), and this can cause serious illness in rabbits. Baby rabbits are especially susceptible to digestive problems happening, so you have to be especially careful with them.
Free feed the hay, meaning it should never run out. Pellets, if you get the same brand and type your neighbor was feeding, then you can just go ahead and feed them a normal amount, which would be enough to last 9 hours, the next 3 hours they will eat their hay, then you feed pellets a second time. So you feed twice a day. You don't want to feed pellets the whole day or the rabbits might not eat their hay, and they need the hay for the fiber as it's healthy for their digestion and can help prevent digestive problems from occurring.
You need to be careful with the veggies. If they aren't causing any mushy poop, then you might be alright to continue feeding them, but you just don't want to overdo it. It's always best to gradually introduce veggies into the diet, starting with one at a time and gradually increasing the amount if it doesn't cause mushy poop or digestive upset where the rabbit stops eating.
This link has more detailed information on the care and feeding of rabbits.
https://rabbit.org/category/care/diet/