Where are the vowels? Mostly not written. Vowels are small dots and dashes under or beside a letter. Children’s books use them. A scroll or a street sign does not.
How old? Hebrew was first written about 3,000 years ago. Scribes still copy the Torah scroll by hand, one letter at a time, with these same letters.
Letters are numbers too Alef is 1, bet is 2, yud is 10. Find the letter for your age. Eleven is yud, then alef: יא