A while back we heard that 50 is the new 30, but Hollywood has gone beyond that, as a whole new reserve corps of talent is emerging to tell us that 70 is the new 35, and that at 60 you’re a mere baby.

This reserve corps is familiar in that it’s also the old reserve corps — the same one that’s been around for a stack of decades. Jane Fonda (78), Martin Sheen (75), Anjelica Huston (64), Diane Keaton (70) and Harrison Ford (73) all belong to this corps, and now there are a bunch of movies out there to showcase their clout and charisma.

“5 Flights Up,” starring Keaton and Morgan Freeman, comes out later this month. Lily Tomlin was up for a Golden Globe Award for her role in “Grandma.”

Before anything else, check out the first season of “Grace and Frankie,” now streaming on Netflix. It’s about the septuagenarian escapades of two San Diego couples — Grace (Jane Fonda) and Robert (Martin Sheen) and Frankie (Lily Tomlin) and Sol (Sam Waterston). The average age of the foursome is 76 but they look, talk and behave like they are in their mid-30s.

Over dinner, the two husbands tell the two wives that for the past 20 years they’ve been lovers and now they want divorces so they can get married to each other. The husbands, that is.

The discarded wives end up at a time-share beach house the couples purchased years ago, and get by on margaritas, online dating and girls’ nights out.

I guess life isn’t as short as we were taught to believe.