A Stem and Leaf graph is two lines close together and then alot of numbers to the right of the lines.
The numbers that are in the tens, twentys and thirtys etc go in betweeen the two lines and the rest of the numbers that go to the right of the stem [the leaves] are just the amount of numbers left behind the first number.
Example below

The numbers still mean the same but you just don't have to write the ten the twenty or the thirty etc you just set it up to the highest number you have and the right the amount that your left with out of 1 to how many you have behind the number.
You can do it for birthdays, ages and dates etc.