https://www.surveymonkey.com/mp/sample-size-calculator

I compiled it like this for a survey of italian's habit:

Population size (Italian): 60,000,000

Confidence level: 95%

Margin of error: 5%

The result is 385, but I would like to divide it into males and females and by 10 age groups each.

If I do 385/20 = 19.25 is that correct?

Then administer the questionnaire to 19.25 males between 20 and 25 years, 19.25 females between 20 and 25 years, 19.25 males between 25 and 30 years and so on. it's correct?