Dynamic table using javascript?

1. add new button doesn't work if any existing row is deleted before adding
2. delete button doesn't work for newly added rows
3. checkbox on the top should select/remove all rows
4. age column is an integer, only numbers allowed

UPDATES

1. add four more columns email, phone number, password, password confirmation. use validation on those columns while typing, if it's not valid then make the background color red, if it's valid background color green. (I.E: password must be at least 8 digits, contains at least 1 integer, confirm password must be same with the password.)