After a string of impotent years filled with sappy singles and flaccid albums, Aerosmith has regained its mojo.

The original retro-rockers got back to their nitty-gritty roots at Hilton Coliseum Friday night, reaching back into a dog-eared songbook that contains gems like “Mama Kin,” “Draw The Line” and “Big Ten Inch Record.”

The rollicking traipse down memory lane was led by the once-Toxic Twins Steven Tyler and Joe Perry.

Despite the deepening lines on Steven Tyler’s face, the lead singer hasn’t lost an ounce of the ad-libbed, innuendo-imbued punch he is known for. Decked out in scarves, bracelets and a pair of bell bottoms tighter than a second skin, 53-year old Tyler pranced, danced and gyrated to the delight of screaming fans. At one point, the Demon of Screamin’ accepted a pink feather boa from a fan in the crowd, which he tucked into the back of his pants as he strutted across stage.

Thirty years of sex, drugs and excess have been kind to Perry as well. With head down, hair in his face and shirt unbuttoned, he is the epitome of the ’70s arena rock hero. His solos during “Dream On” and “Love in an Elevator” were immaculate, as they should be after decades of practice. Perry even stepped up to the lead mic for “Drop Dead Gorgeous,” a rather disappointing Glen Ballard-esque tune from Aerosmith’s new album, “Just Push Play.”

Although more than half of the set list was composed of classics, those new to the Aerosmith fold weren’t let down either, as the band played ’90s hits, such as “Blind Man,” “Livin’ On The Edge” and the cheeky “Pink”.

And of course, the obligatory Diane Warren-penned “I Don’t Want To Miss A Thing” was included, although the band seemed eager to speed things up again as it launched into 1975’s “Walk This Way”.

The stage setup was unique, with a catwalk extending from the main stage that stretched 20 rows into the audience. The boys took turns strutting up and down ramps leading into the parquet section.

Perhaps the best stage feature, however, was the enormous video screen set up behind the band, making every seat in the coliseum a good one.

One questionable aspect was the “HILTON COLISEUM AMES, IA” signs and the TelePrompTers inconspicuously placed at the end of the catwalk and the ramps. Granted, the members of Aerosmith are getting up there, but forgetting song lyrics and the names of the towns they are playing is more characteristic of their drug-hazed yesteryears than today.

But even this was easily forgiven as Tyler, Perry and company pulled the dusty toys from the attic and proved they still have what it takes.