Five daughters send their mothers undercover as 21-year-olds. From dating to working to activism, the mums will be immersed in their world. Can the mums pull off being 21 Again? 1/4 Five daughters send their mums undercover as 21-year-olds. 2/4 In the second phase of the experiment, the girls pack their undercover mums off to work. 3/4 In the third phase of the experiment, the girls push their mums out of their comfort zone. 4/4 In the final leg, have the daughters done enough to bridge the generation gap?