It’s hard to believe that the members of bluegrass act Nickel Creek are so young, considering they’ve been together 18 years.

But fiddler Sara Watkins and mandolin player Chris Thile are each 26, and guitarist Sean Watkins is 30.

So they’re figuring it’s time to go their separate ways, breaking up for now to pursue their own musical interests. Each has his or her own solo work: Thile has formed the band The Punch Brothers, and the Watkins siblings have regular gigs at a Hollywood club under the name The Watkins Family Hour.

“This band needs so much attention for it to run,” Sara Watkins says. “It needs to always be maintained. It needs to always flourish with creativity. And I think we’ve done that for 18 years, and in order for it to ever flourish with creativity again, we have to set it down for awhile and go play with other people and live in a different world. And then we might come together and have it be fertile again.”

Before parting ways, Nickel Creek is going on a “Farewell … For Now” tour that makes a stop Wednesday at Liberty Hall, 642 Mass. The show starts at 8 p.m., with opening act Tom Brosseau.