I slept on a twin until I was a junior in college (then I upgraded to the futon--woohoo!!). A king size bed is the same size as two twins put together, so IMO, a twin size bed is plenty big for one person to sleep on. Unless the next house we get has HUGE bedrooms, I will keep a twin size bed for my kids (or a loft bed or bunk beds)...but anything bigger than a twin takes up more floor space.
We have an unfinished basement and have many humid days in the summer so storing items like a mattress down there would not work. We also have our share of spiders and other small bugs. No thank you!
Now, if I had a nice dry finished basement, storage would not be an issue.
I have two teens. Both are sleeping on twins and I don't plan on changing that. Rooms in our house are small and anything bigger would be a tight fit. We actually replaced dd16's mattress last year and she got a new twin.
I slept on a twin until I got out of college and bought my own furniture for my new apt. Then I bought myself a queen.
I had a twin bed until I was 17 when I bought a full sized futon bed with money I saved from working. My little sister had a twin bed until she moved out of her college dorm and bought a queen mattress for her apartment.
DD is 23 and still is sleeping in her twin loft bed. She likes having 2 dressers under the bed. She has the smallest bedroom in the house (10 x 9), so space is tight. When her brother moved out 2 years ago she was offered his bigger room (10 x 16) with a full size bed, even offered to buy a new mattress, she likes her room better. BTW, she is 5 ' 11"
I slept in a twin bed from age 3 until just before my 25th birthday when I got married. I'm 6' 2" and was plenty comfortable.
my DD started in a full size bed when she was 2 and is still in one at 32 (with the exception of being away at college and when she lived with us after)
My oldest went from the crib right into a double bed because that is what we already had and I wasn't going to go out and buy a twin bed when it wasn't necessary.
My youngest was upgraded to a queen bed last year because we got a king bed for my husband and I so we gave her our old one.
Otherwise she would still be in a twin bed and we'd have just updated her mattress which was in dire need of upgrading.
Dd14 has a twin and we have no intention of getting her a new bed. Her room is pretty big but where the floor vents and windows are a twin is the best fit. She's asked for a bigger bed but when I've told her it's a new bed or X she picks X.
Our D didn't sleep in a twin until she went off to college. We get a lot of overnight company and had queen beds in the kids' rooms up until we moved and had a dedicated guest room. DD still had a queen and the boys ended up with bunk beds for a while.
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