| Twin XL isn't that unusual. Wider buy you nothing. Get the Twin XL. |
^^ Here's your answer |
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A full size, regular length will be fine -- he can sleep diagonally.
I'd get whichever looks better in the room/makes best use of the space. |
| My 14 yr old is 5’10 and we went from a twin to a full. He has a small bedroom. We debated a twin XL, but wanted extra width. It feels so much bigger than the narrow twin - he likes being able to sprawl out or lie diagonally. Yes his feet do hang off in most positions. |
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5'11" at 12 years old for a boy is really tall, especially for a boy! My middle kid is 12 and at 5'7" is one of the tallest in 6th grade. I would get the twin XL and not spend a ton of money on the bed. We have this frame for my DD with a nice headboard. https://www.amazon.com/Assemble-SmartBase-Mattress-Foundation-Replacement/dp/B00R6OXGPO/ref=sr_1_1?qid=1681156346&refinements=p_89%3AZinus&s=furniture&sr=1-1&ufe=app_do%3Aamzn1.fos.006c50ae-5d4c-4777-9bc0-4513d670b6bc&th=1 FWIW- my husband is 6'6" and had a regular twin bed until he went to college. It wasn't ideal but it was fine. |
| People usually sleep curled up, not all limbs extended at all times. |
True but extremely tall people (over 6'4") will extend over the bed even when limbs are not fully extended. If her son is 5'11" at 12, he is probably on track to be well over 6'5". I don't think that an XL is a necessity, but if you are going to be buying a new bed anyway a Twin-XL makes more sense than a Full |
If he has had a queen, then that is the same length as a Twin XL bed. |