Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Represent | Contestant | Age | Height | Hometown |
| --- | --- | --- | --- | --- |
| Alta Verapaz | Casetie Lily Dubois Caravantes | 23 | 1.74 m (5 ft 8 1⁄2 in) | Copán |
| Chimaltenango | Wendy Karina Albizures del Cid | 19 | 1.83 m (6 ft 0 in) | Chimaltenango |
| Ciudad Capital | Rita Elizabeth Meda Cojulún | 19 | 1.77 m (5 ft 9 1⁄2 in) | Ciudad Guatemala |
| Guatemala | Ana Maribel Arana Ruiz | 22 | 1.79 m (5 ft 10 1⁄2 in) | Villa Nueva |
| Izabal | Jessica Jazmín Donabó Chávez | 18 | 1.75 m (5 ft 9 in) | Puerto Barrios |
| Jalapa | Luz Yohana Marroquín Morán | 20 | 1.76 m (5 ft 9 1⁄2 in) | Jalapa |
| Quetzaltenango | Clara Jennifer Chiong Estrada | 24 | 1.81 m (5 ft 11 1⁄2 in) | Quetzaltenango |
Question:
how many delegates are at most 20 years old?
Answer:
4