I will turn 41 this year and my wife will be 45. In fact our birthdays are just 2 days apart in June. Tell her..."You are my mother and no matter how old you get, you will always be beautiful to me." Age does not make no difference in life. Its who the person inside that counts. Since it shows you are worried about your mother than that tells me she has always been there for you. That makes her a very special person.