Lea Thompson has a funny reaction to the cover of Michael J. Fox’s AARP magazine

Lea Thompson lived long enough to see her “son” Michael J. Fox reach retirement age.

Hopefully this doesn’t cause a chain reaction that is undoing the very fabric of the space-time continuum and destroying the entire universe.

The actor had a blast this week with his “Back to the Future” co-star, which appeared on the cover of the latest issue of AARP The Magazine.

“Ummm my son is on the cover of @AARP makes me proud,” she said tweeted with a cover photo. “And a little old.”

Thompson, of course, played Lorraine Baines McFly, the mother of Fox’s character Marty McFly, in the iconic ’80s film.

“Now THIS is heavy”, AARP tweeted, referencing one of Fox’s famous Back to the Future lines.

Fox has reached retirement age after living with Parkinson’s disease for 30 years, serving as an inspiration and tireless fundraiser in the fight against degenerative central nervous system disease.

In real life, Thompson and Fox are both 60 years old and still marvel at the resistance of the 1985 hit in which they play teenage boys outside of the scenes where Thompson plays his adult mother.

The old friends were part of a remote cast reunion last year on “Reunited Apart with Josh Gad” that reminded them of the film trilogy.

“I didn’t really know this movie would still have people who wanted to talk about it. It’s so amazing, ”said Thompson.