In some interview, Sehun explained his ideal type specifically which makes many people thinks that he's actually described someone that really exist. So, I'll just summarize his ideal type from several interview.

SEHUN'S IDEAL TYPE :

1. Has a pale skin.
2. Has double eyelid.
3. Height around 160-164 cm.
4. Weight around 43-45 kg.
5. Has good natural body smells.
6. A girl who has nice body figure, good looking, and must be kind.
7. Has a good sense of fashion.
8. A girl who looks proud and chick but inside is actually delicate and understanding.
9. Good singer / good dancer, a confident girl.
10. A girl who's kind, open / forthright, cheerful, and clean.
11. Bright and clean / neat girl.
12. Someone who sincerely worries about him.
13. A girl who can care to his parents and good to him and must be able to do household chores.

Isn't that he explained the visual he likes very specifically? Hahaha...

Everyone likes clean girls of course...

The interviewer asked if he's okay about dating someone older than him and he answered. "Yes, I likes noonas. I like them a lot.."

Well, he's very specific about his ideal type. Do you think he can really tell in such a detail if that person isn't really exist? For me, I don't think so...

Honestly, what made me surprised the most is the fact that his ideal type really match with Hyuna's description. I don't know if it's just me, but I find it so Hyuna... Hyuna's height is around 162-164 cm and her weight is around 40-44 kg. She obviously has a pale skin, that's why Sunggyu from infinite ever choose her as ideal type because he likes pale girl. Everyone know she has a great body figure, she also good looking. She's one of the most fashionable female idol in industry, proven by how often she invited to famous designer event or fashion show, her airport fashion also in top 10. Hyuna is a very good dancer, not really in singing maybe but she's definitely one of the most succesful female soloist in kpop industry. Like he said about liking a confident girl, Hyuna absolutely very confident especially on stage, her charisma is something that we can't deny. She often looks chick and arrogant but she's actually very sweet, cute and cheerful girl, even a little bit childish. She has a kind heart and always treat elder well. If you watch invicible youth you'll know how caring she is toward elder. She's able to do househould chores and good at cooking as well (watch Hyuna's free month). Owh, and she's very caring to her fans. She even worries a lot if her fans wait for her in cold weather. 

Sehun said that he really likes noonas, so I think he's okay with Hyuna being 2 years older than him. Hahaha... And if you pay attention, most idol will say that they like innocent look than chick look. But sehun said that he likes a girl who look chick on the outside but caring on the inside. It’s really like hyuna. LOL...