GOLDEN VALLEY, Minn. — It's a hot summer day. You're relaxing at the beach with your friends after class. But... what's that smell?

A new poll from YouGov found that 39 percent of 18- to 24-year-olds had not used deodorant in the past 30 days. 

That number went down to 31 percent with 25- to 34-year-olds, 22 percent with 35- to 44-year-olds, and 16 percent when you get to 45-year-olds.

More than 37 percent of 25- to 24-year-olds say they haven't bought deodorant or anti-perspirant in the last year, and that goes up to 48 percent with 18- to 24-year-olds.

YouGov also took a look at whether Americans like to wash their hair daily - but the results were very mixed.

Twenty percent of US adults said "definitely agree," and 19 percent said "definitely disagree." The rest were spread fairly evenly between.

The most likely group to wash their hair every day was 25- to 34-year-olds, but all of the age groups were pretty similar. That is, except for the 55+ group - only 14 percent "definitely agree" that you should wash your hair every day.

Find more information from the poll here.