You're unlikely to become a pop star at any age, and you won't fit into the typical teeny-bopper star at age 50, but.....for example, Seth McFarlane is doing rather well with his record sales, even though he's old and chubby and doesn't fit the 'typical' mold. Also, the Gorillaz. So it's something that can be done.

http://www.musicbusinessworldwide.com/biggest-british-debut-...

Look at who made the biggest-selling British debut album of 2016.