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:
|  | Position | Age |
| --- | --- | --- |
| Gary C. Kelly | Chairman of the Board & Chief Executive Officer | 63 |
| Thomas M. Nealon | President | 57 |
| Michael G. Van de Ven | Chief Operating Officer | 57 |
| Robert E. Jordan | Executive Vice President Corporate Services | 58 |
| Tammy Romo | Executive Vice President & Chief Financial Officer | 56 |
| Mark R. Shaw | Executive Vice President & Chief Legal & Regulatory Officer | 56 |
| Andrew M. Watterson | Executive Vice President & Chief Revenue Officer | 52 |
| Gregory D. Wells | Executive Vice President Daily Operations | 60 |
Question:
How old was Southwest Airlines's president in 2018 ?
Answer:
57