First recorded by Nico (1967).
Covered by The Nitty Gritty Dirt Band (1968), Tom Rush (1970), Jennifer Warnes (1972), Ian Matthews (1973), Jackson Browne (1973), Gregg Allman (1973), Paul Westerberg (2003), Glen Campbell (2008), Jackson Browne & Gregg Allman (2014).
From the wiki: “‘These Days’ was written by Jackson Browne c. 1964, when he was 16-years old. German model, chanteuse and Warhol Superstar Nico was the first to record ‘These Days’ for release, on her October 1967 album Chelsea Girl. The elaborate production featured a fairly fast finger-picking electric guitar part by Browne. The use of that instrument was suggested by Andy Warhol.