Puma hits the big 6-0 this year, and they’re celebrating not with Botox injections or facelifts. Instead, the iconic sports-slash-lifestyle company is embracing the accomplishment with an all-out bash — and you’re invited. Between 6 and 8 p.m. tonight, head to the Puma concept store (333 Newbury Street, Boston, 617.369.7091) for a 20-percent discount on your entire purchase and, of course, some birthday cake. The first 100 shoppers who buy loot worth $50 or more will get a free goodie bag, and a live DJ will spin throughout the event. Puma has withstood the rise and fall of disco, the birth of hip-hop, and the evolution of the track suit from workout gear to street-wear staple, to name just a few milestones. And as part of the company’s b-day soiree, they’ve released the “I Am 60” Decades Collection — modernized re-issues of some classic throwback styles from the 1940s through the ’90s. Forget party hats; pick up some party kicks. Get your name on the guest list at www.puma.com/bday48.