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:
| # | Player | Age | Australian Open | French Open | Wimbledon | US Open |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | Fred Perry | 26.0 | 1934.0 | 1935.0 | 1934.0 | 1933.0 |
| 2.0 | Don Budge | 23.0 | 1938.0 | 1938.0 | 1937.0 | 1937.0 |
| 3.0 | Rod Laver | 24.0 | 1960.0 | 1962.0 | 1961.0 | 1962.0 |
| 4.0 | Roy Emerson | 27.0 | 1961.0 | 1963.0 | 1964.0 | 1961.0 |
| 5.0 | Andre Agassi | 29.0 | 1995.0 | 1999.0 | 1992.0 | 1994.0 |
| 6.0 | Roger Federer | 27.0 | 2004.0 | 2009.0 | 2003.0 | 2004.0 |
Question:
At what age did Roy Emerson complete the Grand Slam?
Answer:
27.0