Willie Nelson celebrates his 92nd birthday Tuesday. Why it matters: Nelson, a cultural icon in his own right, has become a living symbol of Austin. He helped define the city's weirdness and progressive identity,

At 92 years old, Nelson might have trouble getting around, his health scares might be a little scarier, but he still amazes the people he is close to.

Get all the news you need in your inbox each morning. The outlaw country star is also known for his activism, as one of the leading celebrity voices in support of marijuana legalization and biofuels,