Any person, young or old, should steer wide of telecom which is a capital intensive business subject to large bo-m-bust cycles resulting in ever present layoffs and dead end careers. Ever since the IT people took over in the early 2000s, it's been an endless rip and replace operation and a meat grinder for anyone employed in it. You'll get worked long hours for stagnant pay then kicked out the door on a whim.
Good advice from @qq+1kpkaw8fk.