Willie was scheduled to appear with Alison Kraus at Van Andel Arena Friday, August 9.

We'd like to think Willie Nelson will last forever, but the truth is he's getting up there in years.

The 86-year-old country artist has canceled the remainder of his tour because of a breathing problem he needs to have checked out.

Nelson tweeted that he was going to have to have his doctor check him out following the issues which arose at Nelson's last stop in Toledo, OH.

His tour was scheduled to end on Nov. 29 in Thackerville, Oklahoma.

Nelson is 86 years old and he's been smoking pot since 1967, so let's cut him some slack.

No word if Nelson will reschedule. Refunds will be available at the Van Andel box office.