You said 27 so I thought maybe that was a Guiness cat but I love the question cuz I'm a research hound.
There is a Guinness site but I can't seem to log on. Here's what I found from cat-world.com, which seems to be quoting Guinness, but I wouldn't take this as a reputable source b/c it isn't Guinness and b/c it's not familiar. So if you can log onto the Guinness site, that would be a better source.
Oldest living cat: ...the oldest living cat is a Burmese called Kataleena Lady who lives in Melbourne, Australia. Kataleena Lady was born on March 11th, 1977.
Oldest cat: The oldest living cat is Creme Puff of Austin Texas. Born on August 3rd 1967, Creme Puff celebrated her 38th birthday in August 2005.
Also deserving a mention are Puss, who was born in 1903. Puss was owned by Mrs T. Holway of Devon. Puss passed away on 29th November, 1939, one day after his 36th birthday. The second is Granpa who lived to the ripe old age of 34. Granpa Rexs Allen (Granpa for short) was a Sphyx adopted from the Humane Society in Texas.