This sign is on Aspen Mountain.  Warren Miller was born on October 15, 1924 and celebrated his 90th birthday on October 15, 2014.  He died on January 24, 2018.  For more information on him, see this page:  https://warrenmiller.org/

The sign states (in large letters) "Anyone for Skiing?"  That was the title of a Warren Miller film that was released in 1957; see this link:  https://www.youtube.com/watch?v=G9keyA5KSew

See this December 29, 2015 Aspen Times article, "Aspen-Snowmass ski trail signs will honor Warren Miller."   
https://www.aspentimes.com/news/aspen-snowmass-ski-trail-signs-will-honor-warren-miller/

 

This item is part of a Facebook photo album that covers various signs and plaques on Aspen Mountain (you do not need to have a Facebook account in order to view the album):  https://www.facebook.com/media/set/?set=a.451981024873867.101778.100001859201674&type=1&l=9577c13e9e

See two photos of the sign below; click on images to enlarge.