Translate the following question to SQL: How many female people are older than 30 in our record?

Schema: CREATE TABLE people (
    People_ID INT   PRIMARY KEY,
    Name TEXT,
    Country TEXT,
    Is_Male TEXT,
    Age INT,
    UNIQUE (People_ID)
);

CREATE TABLE church (
    Church_ID INT   PRIMARY KEY,
    Name TEXT,
    Organized_by TEXT,
    Open_Date INT,
    Continuation_of TEXT,
    UNIQUE (Church_ID)
);

CREATE TABLE wedding (
    Church_ID INT   PRIMARY KEY,
    Male_ID INT   PRIMARY KEY,
    Female_ID INT   PRIMARY KEY,
    Year INT,
    PRIMARY KEY (Church_ID, Male_ID, Female_ID),
    UNIQUE (Church_ID, Male_ID, Female_ID),
    FOREIGN KEY (Female_ID) REFERENCES people(People_ID),
    FOREIGN KEY (Male_ID) REFERENCES people(People_ID),
    FOREIGN KEY (Church_ID) REFERENCES church(Church_ID)
);
user
SELECT count(*) FROM people WHERE is_male  =  'F' AND age  >  30
assistant