select
    device_id,
    gender,
    (
        case
            when age >= 25 then '25岁及以上'
            when age >=20 and age <25 then '20-24岁'
            when age >=0 and age<20  then '20岁及以下'
            else '其他'
        end
    ) as age_cut
from
    user_profile