Translation of screw in Spanish

Hi, I think it might be easier just to correct your letter here, and then I'll send you another email. I'm really sorry but I don't think you are old! What are you up to? Everything else is an individual decision...
Hi! Thank you for your invitation and for your very kind messages. I'm sorry but it is very late here and I prefer to write you tomorrow. When is the best time to chat? See you later than.
Sorry that I did not write earlier. I have got a lot of work in my office. I did not forget and always think about writing you. What exactly do you study? Do you have children? Are you married?