West Hollywood talent agent Nathan Adler recalls how he first met 80's rocker Brad King, personal trainer Al "Muscles" Carter & actor Ross Stein as he begrudgingly prepares for his 50th birthday party.

After a run-in with a professional rival, not even gifts, cocktails and the boys' valiant efforts can cheer up Nathan on his 50th birthday; Ross receives professional bad news; Brad regales the boys with stories of his sexual conquests of the past 24 hours.

An encounter with a long-forgotten one-night-stand has Nathan feeling his age; Muscles meets a potential Mr. Right; Ross' cheerful façade cracks.

Brad gets revenge on his latest hook-up; Ross receives some provocative marriage advice; Muscles tries to get Bobby to discuss their dilemma; a cryptic session with his shrink leads Nathan to a mind-blowing encounter.

Ross' ultimatum to Neal backfires; Brad gives Muscles tips for tops; Nelson Van Eddy returns to torment the boys; Nathan spends a secret afternoon with Damian.

A young fan tests Ross' resolve; Brad's doctor delivers shocking news; Muscles makes a last-ditch effort to save his relationship with Bobby; a day with Damian has Nathan feeling his age.

The boys meet Bobby at dinner at Ross's house; Brad loses his heart to porn star Rod Rodriguez; Nathan confesses his secret; a misunderstanding between Ross and Neal leads to a bitter argument.

Neal's latest absence pushes Ross over the edge; Brad has a rude awakening about his porn-star crush; after a heart-to-heart with Muscles, Nathan breaks it off with Damian – but learns Damian has other ideas.

The mood is anything but festive as the gang gathers for the wedding of one of their own to notorious former circuit boy Dirk Evans.

Lydia sings at Dirk & Nelson's wedding reception, while Nathan meets photographer Christoph, Muscles makes a declaration to Bobby, Ross is overwhelmed by the romance, and Brad shares bodily fluids with one of the grooms.

The boys discuss weekend plans over brunch; Muscles & Bobby plan a romantic weekend; Ross decides to try an internet hook-up; Nathan makes a date with Damian then comes to blows with Nelson Van Eddy.

Nathan and Damian attempt a romantic evening in each others' worlds, with mixed results; Brad and Ross have an unexpected hotel encounter; Muscles is puzzled as his romantic weekend plans with Bobby fizzle.

Lydia debuts her cabaret act; Brad makes a radical lifestyle change; Nathan meets a man from Damian's past, then makes a call to Christoph; Ross tries something new to save his marriage; Muscles is frustrated.

Muscles makes a special attempt to relight the fire in Bobby; Rod tests Brad's new resolution; Ross & Neal come to a crossroads; Nathan visits a new shrink, then has an explosive confrontation with Damian.

Ross confers with a divorce lawyer; Muscles is attracted to a gym patron; Brad's accountant delivers bad news; still reeling from Damian's disappearance, Nathan has a life-changing accident.

Ross receives good news for a change; Muscles asks Brad for dating advice; Nathan gets a bizarre proposition from Nelson, then spends an evening with Jake; Brad parts with a piece of his past.

Nathan is haunted by his past as the gang gathers for Thanksgiving; Lydia introduces her new boyfriend; an unwelcome guest interrupts dinner; Brad attempts a new career path.

Brad begins a humiliating job search; Ross is cornered by his new leading lady Tanya Dickson; Muscles & Lucas get past third base; Nathan and Jake grow closer.

At Jake's urging, Nathan quits smoking; Brad tries retail but old habits die hard; Muscles questions Lucas with his new suspicions; Ross receives an unsettling welcome home; tensions rise between Lydia and Barbara.

Nathan calls in PR specialist Dan Karmel when Ross' sex tape goes viral; Brad makes another attempt at gainful employment; Muscles meets Lucas' boyfriend; Lydia and Barbara have it out.

On Christmas Eve, disillusioned Muscles heads home to Ohio; Damian's holiday card and no reply from Jake sends Nathan spiraling with indecision; Brad hits rock bottom; Ross, now a tabloid sensation, succumbs to Dan's advances.

Muscles confides in his mom in Ohio; tough love from a counselor leads Nathan to "man up" to Jake before butting heads with Nelson; Ross is forced to make a choice; Brad receives a last-minute rescue.

The Old Dogs & New Tricks celebrate the Supreme Court marriage-equality ruling. On the morning of Friday, June 26, 2015, the boys are surprised by President Obama's announcement of the ruling – but the surprises are just beginning!